Posts Tagged ‘ Night Vision Security Camera ’

What Is A Varifocal Security Camera?

Written By:
Monday, November 26th, 2012

What Is A Varifocal Security CameraWhat Is A Varifocal Security Camera?

One of the best values in security cameras are those equipped with a varifocal lens. These lenses come for a variety of camera styles with the two most popular choices being very-focal lenses on dome cameras and box cameras.

Varifocal Lenses Are Great For Businesses That Plan to Expand

These lenses are perfect in many situations. The first situation is a business that plans to expand to a new location someday. When a camera is equipped with a varifocal lens, then the business owner can easily move the camera to a new location. Adjusting the camera at the new location can easily be accomplished just by adjusting the focal length of the lens.

Varifocal Lenses Are Great For Homeowners On The Move

Many homeowners enjoy this benefit as the camera equipped with a varifocal lens can easily be packed up and moved to a new location. The homeowner may choose to move the camera when they move to a larger property or a smaller property and the lens can easily be adjusted to the new location.

Varifocal Lenses Provide Flexibility

The varifocal lens also makes a great choice for business owners and homeowners who may not be exactly sure what size of lens they need. With fixed distance lenses, the business owner or homeowner must guess at what length of lens that they need. If they guess wrong, then the whole unit must be returned if allowed or sold as a second hand camera costing both time and frustration.

Change Location Of Recording Without Anyone Knowing

These lenses are also super at changing what the camera is recording without having to change the camera position. Without moving the camera, it is possible to record many different situations. This is particularly useful in a commercial setting when you may want to watch one situation one day and another situation the next. The lens will also allow you to change the angle at which you see a situation.

Many people are familiar with the zoom feature of a digital camera and the varifocal lens on a security system works very similar to the lens on that camera. Just like having more zoom ability on a digital camera, the wider the range of objects this camera can be focused on, usually by turning a knob on the outside of the camera’s housing.

Dome Varifocal Security Cameras

Dome security cameras can be equipped with varifocal lenses for both indoor and outdoor use depending on the housing chosen. The most common varifocal lens on dome cameras is the 3.6 mm to 8 mm lens. Remember that the wider the range of numbers the more choices you have when using the camera. Cameras with a 3.6 mm to 8 mm lens have a maximum angle of viewing of 79.22 degrees and a minimum angle of viewing of 33.4 degrees. It is important to look at the distance that you want to install the dome security camera from where the action will likely occur. The smaller the millimeter number the closer the camera will need to be to the action, but the camera will have a wide area where it will What Is A Varifocal Security Camera record the action. The larger the millimeters number the smaller the area that the camera will record the action, but the action can be recorded from further away.

In order to determine the right focal length consider these facts. If you are watching a parking lot with a lower millimeter lens setting, then you will be able to see about six cars parked about 15 feet away. You will be able to see the make and model of the car, but very little else. If you use a camera with a higher millimeter lens, you will be able to see more details, such as car license plates and face details, but you will be able to see very little space.

Infrared Dome Security Camera with Varifocal Lenses

These cameras can be equipped with different types of operating systems. For example, many business owners and homeowners choose infrared security camera with varifocal lenses. These cameras offer the owner the ability to use the camera when no light is available. These cameras emit a small LED light that provides enough light for the camera to operate. It is important to look for a camera with IR power that matches the focal length, as the lights will only broadcast so far.

Day/Night Dome Security Cameras with Varifocal Lenses

Others choose day/night cameras with varifocal lenses. These cameras are equipped with special mirrors that collect any available light and use it to produce the footage. As more light is available, the camera will take colored pictures, but in low light situations, the pictures will have a green tint.

Daytime Dome Security Cameras with Varifocal Lenses

These cameras operate with the available light, so if there are no light these cameras will not operate. They are great in many situations where light is available all the time. An example would be inside a retail store where the lights are left on even at night.

Other Considerations When Buying Dome Security Cameras With Varifocal Lenses

Whichever dome security cameras with a varifocal lens the user chooses to buy, the buyer needs to think about other aspects. The buyer needs to think about how the footage will be viewed. There are several viewing options including a dedicated VCR, connecting it to a computer monitor or watching it on a smart phone. It is also important to consider who will monitor the footage. Some business owners will choose to monitor their own, some will assign a staff person to do this job and others will hire an outside company to do the monitoring.

Resolution on Dome Security Cameras with Varifocal Lenses

The buyer of a security system will want to consider the security systems resolution. This is measured in either TV lines or in megapixels. The higher the cameras resolution, the better the details that can be seen in the footage. The colors will also be truer to real life. A 1.2MP camera has 3.5 times the resolution of an analog camera in its largest format. Therefore most users find megapixels cameras the better buy.

Sensors on Dome Security Cameras with Varifocal Lenses

A very important consideration when buying a dome security camera with varifocal lens is the size of the sensor. The smaller the sensor, often called a CCD chip, the narrower the angle of view. Sensors in these cameras usually come in four different sizes, which are ¼ inch, 1/3 inch, ½ inch and 2/3 inch. If you choose a camera with a ¼ inch sensor then the maximum angle of the field of view is 57.77 degrees and the minimum field of view is 22.62 degrees. If you choose the 1/3 inch sensor, then the maximum angle of the field of view is 79.22 degrees and the minimum is 33.4 degrees. If you choose the half-inch sensor, then the maximum angle of the field of view is 95.63 degrees and the minimum field of view is 43.6 degrees. When you choose the largest sensor, the largest field of view is 113.22 degrees and the smallest field of view is 57.62 degrees.

What Is A Varifocal Security Camera Varifocal Lens Box Camera

Many homeowners and business owners prefer box cameras. These cameras are great because they deter many criminals because of the mere sight of the camera. The most common varifocal lens on the box camera is the 3millimeter to 15millimeter. This gives the user a wide range of angles to choose from when installing the camera inside or outside in protective housing. Just like with the dome cameras, varifocal lenses on box cameras smallest settings give the widest field of view with 15 millimeters giving the narrowest point of view.

Varifocal Lens Box Camera Sensors

It is important to consider the sensor when buying a varifocal lens box camera sensor. Again, like with the dome security camera the user generally has four choices. It is important to notice that the sensor controls the distance the camera can be placed from the target.

Varifocal Lens Bullet Camera

Bullet security cameras can also be equipped with varifocal lenses with the most common being 2.8 to 10mm. These cameras can also be equipped with the four different size sensors. It is important to consider the different combinations for this camera.


Most varifocal lenses cost about 20 to 30 percent more than a fixed lens camera, but consider the flexibility that is afforded with these lenses. One can move the camera to accommodate different situations. One can adjust the length of the lens to get the best picture. Furthermore, a person can buy cameras with different sensors to further expand their flexibility. Making sure that you buy the best camera for your money will assure that you are happy with the choice that you made.

The best process to use when choosing a camera is to choose the location that you want to put the camera in and then choose the style of camera that you want to install. Next, consider buying a camera with a varifocal lens. Then choose the size of sensor that is best for what you want to accomplish now and in the future. Finally, consider the resolution you want in the camera. All of these will factor into the price that you pay. Contact Security Camera King Today!


See In The Dark With A Night Vision Security Camera

Written By:
Thursday, August 16th, 2012

night vision security cameraMany people find night vision security cameras to be the answer to their home and business needs. If you are considering a purchase of a night vision security camera there are several factors to keep in mind.

Factor 1 Image Enhancement

Night vision security cameras work in two ways. The first is by image enhancement. The security camera collects very minuscular amounts of light that are present in the environment and amplifies them so that the viewer of security camera footage can see the image.

The night vision camera often will have an objective lens that focuses the available light on a negatively charged electrode known as a photocathode. This causes the light electrons to increase in speed. These light electrons then find their way through holes in a specially equipped microchannel plate where they bounce off the walls and multiply. These electrons have now become a cloud. The cloud then hits a phosphor screen making the phosphor glow. It is this glow that allows enough light to be produced that the image can be viewed. Night vision cameras using image enhancement will have a green image. Green is used because the human eye can differentiate more shades of green than any other color.

Cameras using this technology have some definite advantages and disadvantages that the buyer needs to be aware of. The first advantage is that these night vision cameras work very well in low-light situations. They also produce acceptable images during the daytime. The night vision camera with image enhancement can produce many frames per second. There is a reduced likelihood of damage to the imaging detector when it comes in contact with a bright light source.

These cameras also require a large amount of power. The night vision camera with an image enhancer must be kept at a stable temperature which causes this energy consumption. Viewers will also see bright spots on the images when the light is too strong compared to the overall darkness. These bright spots, known as blooming, can be caused by street lights or lights in a building.

Factor 2 Thermal Imaging

Night vision security cameras can also depend on thermal imaging. These cameras contain a special lens that focuses the infrared light given off by all objects. The light is then scanned by elements that can detect the infrared light. Quickly a thermogram is produced that gives a very detailed temperature image from several thousand points within the field of view of the night vision security camera lens. From the thermogram electric impulses are then created and sent to a processing unit which translates the information into data which is then displayed.

Factor 3 Night Vision Gain

Night vision cameras work only when there is some available light. As there becomes less available light, night vision cameras offer a fuzzy image at best. It is important when purchasing a new night vision camera to consider the systems gain. The gain is the amount of time the camera amplifies the available light. It is measured as light output divided by light input. The result is the light that the viewer actually sees. Some manufacturers will try to mislead the public talking about tube gain. When comparing security systems, make sure to compare system gain not tube gain. System gain will not always increase clarity. It will also not always increase range of view. More gain is required to view objects that are further away. A great way to do this is with a high-speed lens. These lenses require less magnification. Therefore, they are able to use captured light more effectively.

Factor 4 Range

Four elements determine the range of a night vision camera. The first element is the night vision security system’s ability to magnify an image. The second element is the night vision security system’s resolution. The third element is the amount of light that is available. The final element is the amount of gain that is built into the system. As a general rule, most users will be extremely happy with a camera that shows objects at actual size. At the top end, for clarity, do not buy a product that offers more than three times magnification.

Factor 5 Wireless or Wired

Buyers of night vision security systems have two choices when it comes to powering the unit. They can be wired or wireless. Each has its own advantages and disadvantages.

The advantage of a wired camera is that once the system is in place they are basically maintenance free. However, it may be necessary to hire a professional to do the initial wiring. A wired security camera is usually cheaper to buy. The difference often offsets the difference in having it professionally installed.
A wireless system is easier to install. Often, it is only necessary to plug it in and connect it to your network. These systems are powered by batteries that must be routinely based. The newest trend in batteries for night vision security cameras is cameras that use solar powered batteries. These wireless systems can be easily moved from one location to another.

Factor 6 Type of Camerasindoor security camera

Night vision security cameras come in four different styles. Each has their own set of advantages.
The most popular night vision camera is the box style. These cameras can be used inside or outside when placed in a special protective housing. They are the largest night vision security camera. Some people find that the presence of a night vision camera is great for deterring criminals, just by its site. The lenses in these cameras can be exchanged.
The second most popular night vision camera is the dome camera. These are usually attached directly to an overhead surface. The main disadvantage to a dome camera is that they see only what is directly under the camera. The image is a 360 degree circle which can be hard to interpret for the new viewer. The lenses in these cameras can be exchanged.

The third most popular night vision camera is the bullet camera. These cameras are small and can be easily hidden. They can be used inside or outside with special housing. It is difficult to change the lenses in these cameras.
Night vision point/tilt and zoom cameras are also very popular. These cameras can be remotely controlled. While point/tilt and zoom cameras are extremely popular in other formats they are not as popular as night vision cameras.

Factor 7 IP or Analog Camera

Analog night vision security cameras are cheaper than IP security cameras. Buyers will find that they have a larger number of choices when looking at analog cameras. Most night vision analog cameras work together regardless of the make or model making it easy to upgrade your system at a later day.

On the other hand, IP cameras offer better wireless reception. These cameras provide a more secure encryption network. They also rely on existing network wiring within your home. These cameras have two drawbacks. The first is that they are usually more expensive than a comparable analog camera. These cameras also generally require a higher bandwidth than analog security cameras. If you want to be able to view your night vision security camera from a remote location, then you will need an IP camera so that the images can be viewed over the Internet.

Factor 8 Always On, Motion Detected, Viewer Choice

Night vision security cameras come in three choices. It is important to consider the choice before you make your purchase.
The first choice in a night vision camera is a camera that is always recording. These night vision cameras are usually associated with a day camera. As more light becomes available the camera switches to a day camera with full color images.
The second choice in a night vision camera is a camera that turns itself on when it detects motion. These cameras are great when there is not a lot of activity in a given area. Depending on the camera, it can even send a message to your email or your mobile phone.

The third choice allows the viewer to activate the camera whenever they want too. This allows the viewer to monitor situations they are concerned about. This saves on energy.

Is A Night Vision Camera Right For You?

Only you can answer if a night vision camera is the right choice for your situation. Remember that you need to protect your property. Another popular choice is an infrared security camera that requires no light.

Make sure to consider all your options. Know how you want to use your camera and then consider how those choices will impact the right camera for your individual circumstances. Do not delay in contacting a professional installer who can walk your property with you and make their recommendations. These professionals will have concrete information based on your individual circumstances. For instance, many properties will be best protected by a combination of several different camera types.

Do not delay! The property crime rate continues to grow daily in most areas of the country. Visit to see our full stock of night vision cameras.


Ir Security Cameras

Written By:
Thursday, May 17th, 2012

IR-Security-CameraIR Security Cameras See What No One Else Can

A common misconception about IR security cameras is that they somehow send out infrared scanning waves. Thermographic cameras work on essentially the same principle as traditional photographic cameras. This means that IR security cameras are every bit as flexible as regular CCTV surveillance cameras. Generally, they’re used to extend the range of surveillance equipment in low light areas. There are countless models available, and each of these is best suited for use in a particular type of installation. That being said, they still use a type of photography, so IR security cameras are just as safe to use as any other type of surveillance camera.

Now, there are a few exceptions to those rules. There are numerous types of devices that can paint a target with infrared light to take a better thermographic photo of it. These illuminators can usually be mounted outside of a camera assembly. Some cameras also come preinstalled with LED illuminator diodes on the outside of the lens assembly. Since most infrared energy is invisible, there is usually no indication that these units are working. This makes them perfect for stealthy applications. Some units might provide a small bit of red shifted visible light when one stares directly at them. While infrared energy is usually considered safe, people should not make a habit of staring into illuminator units. For that matter, they shouldn’t be staring into light bulbs either.

An exception to a practical rule involves dedicated night vision equipment. It is generally a bad idea to use cameras rated for night vision in well-lit areas or in outdoor areas under sunlight. Using these outside of their accepted safety parameters can cause damage to the cameras as well as viewing equipment. On the other hand, these are absolutely ideal for use in dark areas or for taking evening surveillance photographs and video.

This might go without saying, since most people would not try to put a pair of night vision goggles on during the day. That being said, there has been plenty of models of IR security cameras on the market that can work equally well in both environments. There are types of IR security cameras that can function in the daylight hours and provide a regular color image. These dual type IR security cameras shouldn’t be confused with Day / Night camera installations, which are something a bit different. Instead, a dual mode camera switches to infrared mode when the ambient light falls below a certain point.

If the camera in question has infrared LEDs installed on it, they would then switch on. Infrared images are monochrome. This is a fact of technology, but it shouldn’t be thought of as a flaw. In fact, images captured in this method can be extremely telling and useful if a break-in were to unfortunately occur. These LED units can extend the camera’s range by quite a bit. That is why IR security cameras are often discussed in terms of how far they can operate in total darkness. This is usually the result of how many LEDs were built into the camera, how powerful they are and if an external illuminator device is being used. There are models on the market that can take images over 125 feet from the installation, and even further away than that. People that need to protect a lonely parking lot or loading dock certainly need this sort of technology.

Camera Lux Measurement

The level of light that a security camera needs to be able to effectively capture an image is referred to as the camera’s lux measurement. The lower this number, the better the camera can see in a low light environment. A camera with 0.2 lux is superior to a camera measured at 0.3 lux. A camera that has a 0.003 lux measurement is supreme. However, a camera running in infrared mode is said to have a lux measurement of 0.0. This literally means that cameras working correctly in this mode can take images in what the human eye would perceive as total darkness.

ir security cameraOne might actually see this lux measurement attached to regular cameras and spotlights. People that work in the surveillance industry are probably already familiar with it. However, for those that aren’t, one simply wants to keep in mind that IR security cameras have a lux measurement that is essentially at 0.0 and therefore they can see in absolute darkness. They continue the fight against crime even when other CCTV units have gone to sleep for the night.

Illuminator LEDs

This is where the question of whether or not something comes out of IR security cameras comes up again. IR security cameras that can shoot video in total darkness work their magic with illuminator LEDs. Some models stock a large number of LEDs so that they can take pictures from even extreme distances. Once again, some of the best models on sale have a range exceeding 125 feet. However, it should still be stressed that this sort of energy is made up of completely safe electromagnetic waves. Infrared energy comes out of a regular light bulb, and it usually isn’t even coherent from any measurable distance.

One might be wondering what the differences between IR security cameras and Day / Night camera installations are. These cameras technically don’t use infrared lighting, so to speak, but instead have special extremely sensitive imaging chips that allow them to take excellent low light level images. These cannot take images without some light, though they perfect for installations around streetlights or other such stands. Only cameras that use infrared lighting can take photographs or video in total darkness. On the other hand, infrared cameras also require more power to keep them on.

Nevertheless, IR security cameras use mostly solid-state technology. LEDs aren’t exactly energy hogs, and they represent a very energy efficient lighting solution for these types of applications. Therefore, one shouldn’t be too afraid of the energy cost. In fact, some older traditional CCTV devices might be using more energy. IR security cameras do not require the use of exterior lighting anyways, so they’re more energy efficient in this respect as well.

Installations in the great outdoors take a little bit of planning, but this is true for all CCTV cameras. In fact, IR security cameras might actually be a little bit easier to install in many cases. The bullet models that come with exterior housings that are already able to stand up to the elements are often quite useful. This class of devices represents a type of technology that is ready to go. They can easily be setup without too much additional planning. Other cameras on the outside might require an exterior housing. When setting up such devices, it might be good to keep in mind how harsh the climate is.

Operating Temperature Ratings

Different IR security cameras have different operating temperature ratings. In very cold or very hot parts of the country, the weather can wreak havoc with CCTV device. Purchasing a good quality housing can defeat moisture and weather. Selecting one of the bullet IR security cameras that already have a housing preinstalled is another great way to beat the climate. If one has to actually install a housing themselves, one should be careful to do so correctly. Many IR security cameras need to be flush with their mountings so that the infrared illuminator LED units don’t experience a splatter effect against the glass. This can be best be understood by imagining a camera with a flash. If one were to take it against a glass window or a mirror, one might get a photo full of light and not much else. The good news is that IR security cameras are really durable, and fixing this sort of a problem takes nothing more than a couple of tools and a few moments of work. It really is that simple to get them to work.

Outdoor exterior illuminator units are an extra set of infrared LED components that provide extra invisible light for IR security cameras. To get an even greater range of surveillance, one can easily install one of these sets. ir security cameraThey are usually mounted near the actual camera unit, and require no other configuration at all besides their actual power supply. For the uninitiated, the idea of a lamp while taking regular photos or video might be an accessible analogy. If one were to take a camera and start shooting photos in a poorly lit room, there could be numerous shadows and dark spots. Proper illumination, even without a flash, can help to take better photographs. The IR illuminator assembly does the same thing, but without visible light. The odd irony is that the lamps used to illuminate the field of vision of a conventional camera will usually also produce some infrared light.

There are several different terms used to discuss the method by which IR security cameras take images, and this can become rather confusing. Regular IR security cameras work either with ambient infrared light or the illumination devices that have already been discussed. These are certainly the most common surveillance units, and usually the most cost effective. They work great for most purposes, and when people in the surveillance industry say IR camera, this is generally what that mean. That doesn’t mean there aren’t other options for those that might want something else, however.

There are a number of thermographic solutions that work via essentially photographing surface temperatures. These cameras are well known even among the general population for their use in movies as well as in the medical field. Cameras that take photographs based on this might be the best for certain installations, though the type of images that they capture is very different from the regular monochrome photos taken by standard IR security cameras. For that matter, many people outside of the scientific and industrial fields actually think of IR as thermal energy.

Infrared Energy

This is not entirely true, since there are several bands of infrared energy, but heated objects at room temperature give it off. Infrared energy is also largely what causes sunlight to be pleasantly warm. Naturally, the human body is a very warm thing from the standpoint of such terminology. Therefore, human beings and animals show up very clearly on thermographic images. This is perfect for those situations where an individual might need to take certain types of industrial measurements, though a thermographic image isn’t usually a first line of defense when trying to work with surveillance for safekeeping purposes. That doesn’t mean that it doesn’t have plenty of uses in the field, however.

On the other hand, so-called light amplification night vision cameras might be acceptable in some purposes. These are also well known among members of the general public, and they’ve often been used in movies and television shows. That doesn’t mean that they work miracles in the real world, but they certainly are another way that images can be captured in dark areas. Naturally, size is another concern to keep in mind when shopping for IR security cameras. Solid-state engineering keeps the size down in the same way that it keeps energy consumption down. That being said, there are extremely small models that may be installed in out of the way places.

Wireless connectivity might be an option that some people with IP networks would want to take a look at. Internet connections with encryption are becoming a more common CCTV solution in the modern world. While IR security cameras aren’t the first things that most people think of when they think of wireless designs, that doesn’t mean that they are impossible to find. With an appropriate dealer, one should be able to find just about any type of tool they could need.

There are so many possible uses of IR security cameras that one couldn’t list them all in one sitting. Numerous areas become dark at night, since this is a basic rule of nature. By using an invisible portion of the light spectrum, IR security cameras can see even when the human eye can’t. Such technology is a powerful tool in the war on criminal activity. Contact us today for your IR security camera needs.



Wireless Night Vision Outdoor Security Camera

Tuesday, June 1st, 2010

A wireless night vision outdoor security camera is a digital video camera with highly specialized features. Modern technological advancements have made these specialized features available at a very affordable price while offering high quality video images.

Outdoor security cameras differ from their counterparts the indoor security cameras, in that they are enclosed in a case that protects them from weather and environmental elements. Wireless night vision outdoor security cameras are often rated according to the protection that they offer. This protection is often described using an International Electrical Code standard called an Ingress Protection rating, International Protection Rating, or IP code. Most wireless night vision outdoor security cameras have an IP code of IP66 or IP67. IP66 means that the camera is dust tight and that water from powerful jets in any direction will have no harmful effects on the camera. IP67 means that the camera is dust tight and can withstand being submerged in water up to 1 meter in depth.

Digital video security cameras create images by using one of two special electronic sensor chips. Some digital security cameras use a Complimentary Metal Oxide Semiconductor or CMOS chip to create high quality color video images. Most wireless night vision outdoor security cameras use a Charged Coupled Device or CCD to create high quality color video using available visible light and high quality monochromatic or black and white video images using infrared (IR) radiation.

CCDs are highly sensitive to light energy known as photons. The CCD is able to transfer light energy into electrical energy in a somewhat similar process that a solar cell transfers sunlight into electricity. The electrical energy created by the CCD can be measured and digitally manipulated to create a video image. This is how a wireless night vision outdoor security camera creates high quality video in visible light conditions.

A wireless night vision outdoor security camera has a highly sensitive CCD that not only captures visible light but is inherently sensitive to radiation in the near infrared spectrum. This allows the camera to produce high quality video images in conditions of total darkness, with absolutely no visible light. These cameras contain an collection of IR Light Emitting Diodes or IR LEDs that surround the camera lens. The LEDs emit IR light that is not visible to the human eye, but lights up the cameras target area or field of vision like a flood light or spot light. Usually, the more LEDs that surround the camera lens, the farther the range that the camera can produce IR video in total darkness. Since IR radiation is not in the visible light spectrum, IR video is monochromatic or black and white.

Another specialized feature of a wireless night vision outdoor security camera is that it does not require a coaxial cable to transmit its video signals to the systems processor. “Wired” security cameras must be individually cabled to the processing unit. A wireless camera utilizes the 2.8 or 5.8 MHz radio band to transmit its video data by using an on-board antenna. The information is transmitted to a corresponding receiver that is normally located in the same area as the processor. After the receiver obtains the video signal it transfers it to the processor where a digital video file is created that may be viewed on a monitor or stored for later viewing or archival proposes.

Wireless night vision outdoor security cameras are available in different transmission ranges. The range is known as Line-Of-Sight or LOS. This means that the maximum transmission range stated for the camera is under conditions where there is an unimpeded line of sight between the camera’s antenna and the receiver’s antenna. Objects between them reduce the range, depending on the object’s size and material. Wireless cameras have LOS range capabilities of several hundred feet.

Additional features available for wireless night vision outdoor security cameras include the ability to record audio and the pan, tilt, and/or zoom (PTZ) functions. PTZ functions allow the camera to move in several directions and the zoom feature functions like a variable telephoto lens. These features can be controlled automatically or they may be controlled manually by remote control.

A wireless night vision outdoor security camera can be used anywhere that outdoor day/night video security and surveillance monitoring is needed. These cameras are often used for perimeter monitoring for both businesses and residents. In addition that can be used to provide monitoring for parking lots, driveways, and outdoor structures.


40 Color Night Vision Security Camera

Thursday, May 6th, 2010

Thanks to relatively recent technological advances in electronic imaging, night vision security cameras are becoming one of the most popular types of security/surveillance cameras for businesses and residences alike. Before purchasing a night vision security camera it’s important that you are familiar with some of the terminology and functions associated with this specialized type of security system.

Most Closed Circuit Television or CCTV cameras today are digital cameras. Basically, they take pictures or video much the same way as a personal digital camera or camcorder. These cameras operate by allowing light to penetrate through an iris or variable opening, a lens, and then strike a charged coupled device or CCD.

The iris is basically like the pupil of an eyeball; when there is too much light the iris makes the opening in the lens very small so as not to “flood” the CCD with light. When there is very little or no light, such is the case for night vision security cameras, the iris is at its maximum opening to allow as much available light as possible to strike the CCD.

The chief purpose of the lens is to keep an image at a certain distance in focus. Various lens sizes can be used to achieve focus ranges from just a few feet to several hundred. If the lens is rated with an “F-Stop” the lower the number for night vision purposes is better because it means it does not absorb much of the light passing through it.

The key to a night vision security camera is the CCD. CCDs work by converting light into electrons. These electrons have a charge which can be monitored and used to produce a digital image. Most CCDs are inherently sensitive to infrared (IR) radiation. This means that they require no special treatment to produce images using infrared radiation.

There are basically two types of security cameras used as night vision security cameras. It’s important to understand the difference between the two. One type is also called a day/night camera and the other is an IR camera.

Day/night cameras produce color images when sufficient light is present. These cameras have very sensitive CCDs that allow the camera to process light into an image at very low light intensity. Light intensity is normally measured in units called LUX. In full daylight (but not direct sunlight) an average LUX reading ranges from 10,000 to 25,000 LUX. By contrast, a full moon on a clear night in non-tropical geographical locations produces about .27 LUX. Many day/night cameras can produce clear images at less than 1 LUX. In fact some day/night vision security cameras’ specifications indicate sensitivities as low as .0014 LUX or less. However, day/night cameras must have some available light to produce an image. They cannot produce an image in total darkness or 0 LUX.

Night vision security cameras that can produce images in 0 LUX or no-light conditions are infrared cameras. These cameras can “see” infrared radiation in the 700 – 1400 nanometer wavelength range known as “near infrared.” The human eye cannot see this wavelength of electromagnetic radiation so any “near infrared” light is virtually invisible to our eyes.

Night vision security cameras using IR technology illuminate their target area with infrared light. This light is provided by light emitting diodes or LEDs that are placed around the lens of the camera. The stronger the LEDs and the greater number of LEDs placed around the camera lens determines the effective range and field of vision of IR cameras. In essence, the LEDs are actually providing a spotlight on the target area but because the light is the near infrared type we cannot see it.

Night vision security cameras using IR technology produce a black and white or monochromatic image. This radiation is outside the visible color spectrum therefore the images are not in color. However, the clarity and contrast is just as sharp as normal color images. Also, the range of the infrared night vision security camera is limited by the infrared light produced by the LEDs. Most premium IR cameras have an effective operating range of up to about 150 feet. It’s imperative to know the specification for IR range when purchasing an IR camera as a camera with a very short range would be useless for monitoring an area 100 feet from the camera.

Knowing a little about the two types of night vision security camera can help you make the right choice for your needs.