fotoopa has posted photographs and schematics showing his hardware design for taking pictures of insects in flight. While the depth-of-field is very thin (credit card thickness), the pictures he has posted are astounding.
Focus distance can by adjusted to every value. The focus range of the detector is very narrow. 1 to 2 mm at a distance of 700 mm form the camera. Objects of 2 mm diameter can by easily detected. Detector works also on full black insects. 4 lasers are used, 2 IR 5 mw lasers at 850 nm and 2 x 10 mw green lasers. The green lasers are only for visual position to the insects.

