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Hunting
Coyote Hunting - From 10 Yards to over 1,000 Yards
Thermal scopes
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<blockquote data-quote="JustMe2" data-source="post: 1990982" data-attributes="member: 42494"><p>I spent part of my military career testing night vision systems installed on aircraft and on personnel. The terminology used above is wrong and confusing. Night Vision (NV) is a term used to describe any equipment that helps humans see in darkness. There are 2 common radiometric bands used for NV systems, near IR and far IR. Human eyes detect light in the .5 to .8 micron range. Near IR is approximately .8 to 1.5 microns and far IR is about 2.5 to 5 micons, therefore the description of "near" our vision and "far" farther from our vision spectra. Consequently, the accepted terminology for near IR is "light intensification" and for far IR is "thermal". Light intensification systems magnify the intensity of the moon, stars, and other ambient light sources including IR flashlights. Far IR is thermal because it magnifies "heat" sources and not light.</p><p></p><p>Now what are their advantages and disadvantages? Think of light intensification systems as receiving reflected light as your eyes do. Consequently, targets in the shadows will be hard or impossible to see because trees, etc block the moon and starlight. Also, use of an IR flashlight will sometimes be too bright like looking into the sun with your eyes . This happens when the IR flashlight is reflected off closer objects than your target so again you can't see the target.</p><p></p><p>Thermal is NOT reflected energy. It is a passive system that magnifies the heat emitted from objects like your target, trees, grass, etc. Consequently, you can see targets standing in the shadows, on moonless and starless nights. The downside is thermal is not as clear as light intensification systems until you get into the $10k systems. However, thermal makes it easier to spot game at longer distances as a hot spot, but maybe not positively identify what that hot spot is. Is it a dog, coyote, deer, calf, etc???</p><p></p><p>So if you're hunting over an open field, light intensification can be used. If you're hunting in heavy foilage with many trees and bushes, thermal will be a better choice.</p></blockquote><p></p>
[QUOTE="JustMe2, post: 1990982, member: 42494"] I spent part of my military career testing night vision systems installed on aircraft and on personnel. The terminology used above is wrong and confusing. Night Vision (NV) is a term used to describe any equipment that helps humans see in darkness. There are 2 common radiometric bands used for NV systems, near IR and far IR. Human eyes detect light in the .5 to .8 micron range. Near IR is approximately .8 to 1.5 microns and far IR is about 2.5 to 5 micons, therefore the description of "near" our vision and "far" farther from our vision spectra. Consequently, the accepted terminology for near IR is "light intensification" and for far IR is "thermal". Light intensification systems magnify the intensity of the moon, stars, and other ambient light sources including IR flashlights. Far IR is thermal because it magnifies "heat" sources and not light. Now what are their advantages and disadvantages? Think of light intensification systems as receiving reflected light as your eyes do. Consequently, targets in the shadows will be hard or impossible to see because trees, etc block the moon and starlight. Also, use of an IR flashlight will sometimes be too bright like looking into the sun with your eyes . This happens when the IR flashlight is reflected off closer objects than your target so again you can't see the target. Thermal is NOT reflected energy. It is a passive system that magnifies the heat emitted from objects like your target, trees, grass, etc. Consequently, you can see targets standing in the shadows, on moonless and starless nights. The downside is thermal is not as clear as light intensification systems until you get into the $10k systems. However, thermal makes it easier to spot game at longer distances as a hot spot, but maybe not positively identify what that hot spot is. Is it a dog, coyote, deer, calf, etc??? So if you're hunting over an open field, light intensification can be used. If you're hunting in heavy foilage with many trees and bushes, thermal will be a better choice. [/QUOTE]
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Coyote Hunting - From 10 Yards to over 1,000 Yards
Thermal scopes
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