Posts Tagged ‘ varifocal’



Bullet Security Camera

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Friday, September 2nd, 2011

There are basically three types of digital video cameras:  1) The dome camera; 2) The box camera; and, the bullet security camera.  In this article we are going to focus our attention on the bullet security camera.

The bullet camera is versatile in its own way as a matter of function of how it is made.  In other words, there are some features on bullet security camera that are definitely beneficial that come as standard on bullet cameras that may require extra charges to have on other type cameras.

For example, just about every bullet security camera is indoor/outdoor; no special housing is required as it comes already housed.  This is a money saving feature compared to a box camera which requires that you buy a separate housing.  Many bullet cameras are set up for infrared video imagery and that includes the InfraRed Light Emitting Diodes or IR LEDs placed in an array around the lens; again standard feature for a bullet camera.

One downside to a bullet camera is that they are not vandal proof.  That is, they can easily be repositioned, so you must consider at what height and location you’ll want to install the bullet security camera.

Security Camera King has a wide range of bullet security cameras from 420 TVL to a whopping 700 TVL that provides the industry ultimate in resolution.  These cameras are normally encased in a metal housing (usually aluminum), come with their own board lens (factory installed and fixed to the circuit board), are infrared ready, and usually have anywhere from a few to 23 or more IR LEDs scattered in an array around the lens.

We have a total of eight bullet security cameras on our bullet camera page.

As you can see there is a wide range of bullet security cameras to choose from at outstandingly low prices.  These cameras are pretty versatile when you consider the features and options that are available.  The cameras are all weatherproof but they are all indoor cameras as well.

If you are interested in purchasing a bullet security Camera or need more information about it, contact one of our security experts today via “Live Chat” or telephone at 866-573-8878 Monday through Friday from 9AM until 6PM EST.

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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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