PVS-21—The Secret Weapon of The Night

https://www.somogear.com/somogear-an-pvs-21-night-vision-goggles-dummy-model/
https://www.somogear.com/somogear-an-pvs-21-night-vision-goggles-dummy-model/

The PVS-21 is the artifact of the night
  •  the dark technology of night vision. Low light level night vision devices went from the first generation to the fourth generation, and basically, apart from imaging clarity, there hasn't been much progress, especially in the two crucial issues of depth of field and field of view. 
  • The PVS-21 Low Profile Night Vision Goggle has been designed for aggressive special operations capability in air, water, and land environments
  • . The patented low profile design offers 3-4 inches less protrusion than conventional night vision goggles enabling a wide range of mission applications. 
  • GPNVG-18 mainly solves the problem of field of view through the superposition of four night vision devices. 
  • However, compared with GPNVG-18, the PVS-21 low-light night vision device achieves both depth of field and field of view, and also adopts laser holographic projection. So the PVS-21 is the good choice for you in the dark place.
 And I would introduce some features about the PVS-21:
PVS-21 1.Aggressive ground use over rugged terrain
 2.High-speed vehicle operations (ground, water, air)Urban/Close     3.Quarters Battle operations
4. Enhanced situational awareness through sensor fusion
5. Parachute operations (free fall and static line)
Aside from lighting up your eyeballs with green light, the other problem I had with the PVS-21 is the size.
Due to the complicated light bouncing in each side, the housing blocks a lot of your peripheral vision. When wearing normal night vision goggles like dual-tube binos, you can typically look under or around the tubes to see your environment. 
I had hoped that since you are actually looking through a prism that at some point visible light will be able to shine through the lens even if the image intensifying tubes were turned on. While technically it does work, it is not useful. 
The proximity of the objective lens is too close to the eyepiece and your image gets shifted a bit. But with the help of the PVS-15, it would improve this problem in a large extent. From some reports we can learn from that the PVS-21 has some special functions which make it more favored by weapons enthusiasts. What’s more, the PVS-21 is good for driving, if you come into a lit area, or oncoming traffic the non amplified or true image takes over in the beam combiner, same thing when moving from a dark halt way to a lit room. Sometimes you get a double image effect, but its not to bad. Plus you can just turn them off and see right through them. But it is not real one for selling except for military use. The Night Vison simulator is similar to the PVS-21 in appearance, but has no actual function, but can largely meet users’ simulation needs.

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