Night Vision Thermal objective lens ?
- Thread starter Newtoit
- Start date
First, the numbers we toss around, like 35mm or 60mm are actually "focal length" rather than "diameter".
That said, more focal length usually corresponds to more diameter.
Larger diameter lenses provide more intake of "information" ... and especially in "poor thermal conditions" this results in a slightly improved image, over smaller lenses.
More focal length, usually means more magnification and more magnification on the objective front end) can be good and bad. The good news is you can use that magnification to resolve what you are seeing at greater distances. That is, you can perform "Positive ID" on smaller critters at greater distances more rapidly.
Tradeoffs to more magnification (and more focal length and larger lenses) ... include reduced Field of View (FOV) ... that means the area you can see thru the lens is smaller. Also, the larger lenses weight more ... and they cost more.
30hz is roughly the same as your eyeball ... so yes sufficient for shooting moving targets. The 60hz, consumes batteries 50% faster.
==
A few examples:
TEO MK2 Focal Length: 19mm, Magnification 1.5x, FOV: 22 degrees, ~$5k
TEO Mk3 Focal Length: 35mm, Magnification 2.5x, FOV 12 degrees ~$6.5k
TEO MK3 Focal Length: 60mm, Magnification 4.5x, FOV 7 degrees, ~$8k
That said, more focal length usually corresponds to more diameter.
Larger diameter lenses provide more intake of "information" ... and especially in "poor thermal conditions" this results in a slightly improved image, over smaller lenses.
More focal length, usually means more magnification and more magnification on the objective front end) can be good and bad. The good news is you can use that magnification to resolve what you are seeing at greater distances. That is, you can perform "Positive ID" on smaller critters at greater distances more rapidly.
Tradeoffs to more magnification (and more focal length and larger lenses) ... include reduced Field of View (FOV) ... that means the area you can see thru the lens is smaller. Also, the larger lenses weight more ... and they cost more.
30hz is roughly the same as your eyeball ... so yes sufficient for shooting moving targets. The 60hz, consumes batteries 50% faster.
==
A few examples:
TEO MK2 Focal Length: 19mm, Magnification 1.5x, FOV: 22 degrees, ~$5k
TEO Mk3 Focal Length: 35mm, Magnification 2.5x, FOV 12 degrees ~$6.5k
TEO MK3 Focal Length: 60mm, Magnification 4.5x, FOV 7 degrees, ~$8k
