Posts Tagged ‘ lens’



Hidden Camera Equipment

Written By:
Tuesday, September 6th, 2011

Security Camera King has a full selection of hidden camera equipment to satisfy your needs.  Modern technology has resulted in a tremendous variety of disguised and hidden camera equipment.  As a matter of fact, the smallest hidden camera that we offer for sale is the size of a Phillips head screw!

How does hidden camera equipment work?  The following is a brief explanation.

First the camera must have a lens.  The lens’s duty is to gather the light reflected by the objects in its field of view and focus them onto a sensor chip no larger than 1/4 to 1/3 inches square.  Most often but not always, hidden cameras use 3.7 mm wide angle lenses.

The sensor chip is the key factor of a digital camera.  There are two different types of sensor chips and although they both work a little differently, the both produce the same result, electrical impulses that can be measured and used to create a digital video image.

The two sensor types that do this are either the Charged Coupled Device or CCD or the Complementary Metal Oxide Semiconductor or CMOS.  Without at least one of these sensors, the camera just wouldn’t be possible.  You can see that since the lens and sensor chips are so small they can easily be packaged in such a way that no one would suspect the hidden camera.

However, there are some electronic components that are required but these are normally wired in small Integrated Circuit (IC) chips which take up very little space.  One of these chips is an analog to digital converter.  Ironically the signal up to this point has been an analog signal and the analog to digital converter changes it to full binary or digital data.

Once the data has been finalized it is sent to the Digital Video Recorder or DVR.  The DVR differs depending on the type of camera.  Some cameras are hardwired to the DVR via a coaxial video transmission cable and others have their own on-board miniature DVRs that normally save their information to either on-board memory or portable media such as SD cards, Thumb flash drives, and the like.  The latter case allows for complete independence (and makes for great hidden camera equipment) for the camera; in other words it is self-contained and needs no wiring.  These units also usually operate on one-time-use or rechargeable batteries

So, with the above in consideration we can categorize hidden cameras and hidden camera equipment into two different categories.  One where the camera is wired through to a digital video system’s DVR; and standalone (and usually portable) self-contained units.

Security Camera King offers a full line of hidden camera equipment including the two categories mentioned above.  It would be a bit tedious to mention any properties or features of these cameras in the space that we have in this article.  But to make you aware of the vast supply Security Camera King has, we will list the different cameras that are available representing both categories we have previously mentioned.

Hidden Security Cameras

  • 420 TVL Motion Detector
  • 420 TVL Smoke Detector
  • 420 TVL Mirror
  • 420 Pinhole Security Camera
  • Fire Ceiling Sprinkler
  • Hidden Stick
  • Hidden Pen
  • Wired Button Camera with extra matching buttons
  • Phillips screw head
  • Hidden Wristwatch Camera
  • Desktop Speakers
  • Exit Sign
  • Wall Clock
  • Wired Alarm Clock
  • Wired Wall Clock with Humidity and Temp
  • Wired Cordless House Phone
  • Suspended Animation Clock
  • CD/Boombox
  • Wired Emergency Light
  • Wired Thermostat

Wireless Hidden Cameras

These cameras transmit their video data via an on-board transmitter to a corresponding receiver.

  • Button
  • Screw
  • Baby Monitor Stuffed Puppy
  • Motion Detector
  • Wall Clock
  • Exit Sign
  • Desktop Speakers
  • Vanity Mirror
  • Carbon Monoxide Detector
  • Wind Tunnel Fan
  • CD/BoomBox
  • Utility Box
  • Air Wick Air Freshner
  • Tissue Box
  • Smoke Detector
  • Emergency Light
  • Wall mirror

Hidden Camera Systems

  • Portable Cigarette Lighter
  • Mini Desk Clock
  • Sunglasses
  • Key Chain
  • Small or Large Spot Light
  • Motion Detector
  • Rearview Mirror
  • Electrical Outlet
  • Air Freshner
  • Air Purifier
  • Exit SIgn
  • Wall Clock
  • Alarm Clock
  • Boombox
  • Desk Lamp

Check out Security Camera Kings hidden camera equipment Web pages for more information or contact one of our security experts if you have any questions.

 

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What is a Varifocal Lens?

Written By:
Sunday, November 29th, 2009

For the novice, security cameras choices may seem confusing. One question often asked by customers is what is a Vari-Focal Lens? There are two basic types of CCTV lenses. You can either get a fixed lens, or a vari-focal lens. A fixed lens has a set aperture that cannot be changed. They can be used for overviews or for close up detail, but they cannot be used for both or be adjusted. When you purchase a fixed lens, you will want to use a lens caluculator to make sure you are getting a lens with the correct aperture since you cannot adjust it once you install it.

A Vari-Focal lens is usually more expensive, but it allows you to adjust the aperture on the fly. This leaves less room for error and would also allow you to make changes to the view at a later date. Varifocal lenses come in various apertures. These are the general lense sizes. 2.8-12mm lens, 3.5-8mm lens, 6-60mm lens, and 5-100mm lens. The larger the aperture number, the more zoomed in the image will appear and the greater detail that can be captured. The smaller the aperture number, the wider the view and less detail will be captured. Keep in mind that all lenses have a give or take. The larger the aperture, the greater the detail, but you will get less of a field of view, so the image will be narrower. The smaller the aperture, the wider the field of view, but the less detail you will get.

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