What is a NVD (Night Vision Device)? A Night Vision Device is electronically increased optical device that enables us to see in near-total darkness. back to top
What are some precautions to using Night Vision? - The NVD should not be turned on in day light - The NVD should not be aimed at bright light (even in the dark) - The NVD should not be disassembled without professional assistance - Try not to drop or shake the NVD - The objective lens of the NVD should not be touched (touch it only with soft non-abrasive cloth) - It is better to keep the device in a case, in order not to damage it. back to top
How does Night Vision work? Night vision devices gather existing ambient light (starlight, moonlight or infra-red light) through the front lens. This light, which is made up of photons goes into a photocathode tube that changes the photons to electrons. The electrons are then amplified to a much greater number through an electrical and chemical process. The electrons are then hurled against a phosphorus screen that changes the amplified electrons back into visible light that you see through the eyepiece. The image will now be a clear green-hued amplified re-creation of the scene you were observing.
Read more... How Night Vision Works and science.howstuffworks.com back to top
What is the difference between the 1 Gen and the 2 Gen? Gen 1 night vision equipment is build around image intensifier tubes with very simple configurations. Gen 1 image tube is vacuum-sealed. Gen 1 equipment has lower light amplification (gain) and image quality (resolution) when compared with Gen 2 and 3, especially on the edges of the screen. Nevertheless, Gen 1 night vision is the most popular and demanded product line of night vision units on the consumer market. Gen 1 equipment is great to have fun with and satisfies the needs of most recreational demands. Gen 2 equipment is enhanced by utilizing a micro-channel plate (MCP). MCP looks like a honeycomb where each cell has a large number of channels for electrons to enter. For each accelerated electron emitted by the photocathode it strikes the channels of the MCP, about 1000 electrons come out on the other end. MCP boosts light gain of an image tube by about 1000 times. As a result the output image is brighter and clearer. Gen 2 equipment is costly and fits the needs of more advanced users. It is widely used for tactical and professional surveillance purposes. more... back to top
How a NVD can be focused? - A regular scope has an objective lens and eyepiece adjustment. First, adjust the objective lens to perfect the image. Then adjust the eyepiece to your eyesight. - In binoculars or goggles each eyepiece must be adjusted separately. To do this close your left eye and adjust the right eyepiece. Then open you left eye and adjust the left eyepiece to get a full contrast image. Some night vision goggles require objective focusing first, and then adjusting the eyepieces. NB: Remember that all night vision devices have a minimal focusing distance, a minimal distance at which objects can appear in full focus. back to top
How far can you see with a NVD? There are many different variables that can effect the distance that you can see with a Night Vision device. The larger the object the easier it is too see. If you're trying to see details we call this recognition range and if you're just trying to see whether something there is or maybe you will just see movement but won't be able to 100% determine who or what it is. This is called detection range. Another variable is lighting conditions. The more ambient light you have (starlight, moonlight, infrared light) the better and further you will be able to see. You can always see further on a night where the moon and stars are out then if it is cloudy and overcast. We typically state that you can tell the difference between a male and a female or a dog and a deer at about 75 to 100 yards. However, if you were looking across an open field and there was a half moon out you could see a barn or a house 500 yards away. NB: Remember, that the purpose of an NVD is to see in the dark not necessarily a long ways like a binocular. back to top
What is Infrared Illuminator (IRI) meant for? (Complete Darkness) All Starlight scopes need some light to amplify. This means that if you were in complete darkness you could not see. Due to this we have a built in infra-red illuminator (IRI) on all of our scopes. Basically what an IRI does is throw out a beam of infra-red light that is near invisible to the naked eye but your NVD can see it. This allows you to use your scope even in total darkness. The IRI works like a flashlight and the distance you can see with it will be limited. This allows our IRI to extend out to 100 yards However, because of the power at a short distance the IRI may cover only 40-60% of the viewing area. back to top