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Surveillance equipment: See without being seen

 
For discreet low- or no-light surveillance equipment, choose a night vision device. Need to see in near darkness for a security patrol or other reason? Consider purchasing a night vision device (NVD) to add to your collection of surveillance equipment.

A night vision device is a piece of surveillance equipment. Partially electronic and partially optical, an NVD, with its enhanced functionality is perfect for night missions. The astonishing light amplification power of some NVDs can be as high as 22,000 times. Although the image quality can vary with distance, environment and most importantly, price, even a less-expensive "Generation I" instrument can amplify up to 500x.

Night vision optics are similar to other optics in that they focus light. The difference is that an NVD focuses the image on one end of a device known as a light intensifier tube. This tube converts the light into electrons which are amplified and accelerated onto a phosphor-covered screen, similar to an older-generation television screen. The electrons cause the phospors to glow, producing an image that can be seen through one or two eyepieces. The display is monochrome on a green screen. If no light is available, some NVDs have built-in infrared emitters that can cast small amounts of this nearly-invisible light on the subject. Typical range of a basic model NVD is 5 - 200 feet, making it a useful item of surveillance equipment.

As surveillance equipment, NVDs are as easy to use as a video camera but require a dual focusing procedure. Step one is to focus the eyepiece on the internal green screen. Step two is to focus the lens on the subject. The whole focusing process takes just a few seconds.

If you want to discreetly observe in very low light without anyone being aware of your presence, consider an NVD. To learn more about these important pieces of surveillance equipment, click one of the links below to view specifications and descriptions.

Binoculars
Telescopes
Rifle Scopes
Night Vision
Spotting Scopes
Laser Sights
Range Finders
Night Vision Goggles

About The Author:

Rita Liotta is a successful author and publisher at www.1st-at-binoculars.com.  Recommending binoculars, telescopes, rifle scopes, night vision, spotting scopes, laser sights, range finders & night vision goggles.
10-06-04