The best Infrared spotting setups
Experience shows that the best IR setups are the ones where you have full
control of the zooming lens: zoom, focus and iris opening, lens with
automatic iris suffer exactly the same shortcomings that cameras with
automatic focus: the results are not optimal for tracking small objects in
the atmosphere with all kind of different objects and lighting conditions
in the field of view.
Experience also shows that in these manual lens the iris opening should be
kept to a minimum allowing very little light to reach the camera sensor, in
that way contrast and "depth of focus" are increased: more range
for objects to be in focus and that is critical for detection.
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