4X Objective Lens Test Comparison - Part 1

[cactuspic]

Robert, thanks for all your care and effort. The tests really help those of us on a limited budget more efficiently buy equipment that makes a difference in our photography. Great work.

Irwin

[ray_parkhurst]

Robert...this may have been mentioned, but have you considered doing a 3D rendering of the stacks in order to compare the field flatness of these objectives? I did that a while back and it was useful. I used a flat surface (your wafer will be much better) and the rendering gave me a good indication of the shape of the focused surface. As I remember, one of the objectives I tested had decent sharpness at the corners, but the field un-flatness was so severe that it took an inordinate number of shots to get the whole surface in focus. So although it "could" produce a sharp image of the whole surface, it was not practical. A true plan objective could do the same job in just a few shots.