"Hybrid" 160mm TL Zeiss KPL eyepiece projection photography
Posted: Sun Apr 11, 2021 7:06 pm
Very recent experiments on "hybrid" Zeiss eyepiece projection photography with my 160 TL Zeiss microscope. I was motivated by the work of Rolf Vossen ("Microphotography with ‘hybrid’ eyepieces", https://microscopyofnature.com/experiments-and-tests), and exchange of ideas with Bob (MicroBob). My projecting eyepiece is actually "half-hybrid": the eye lens from a 10x KPL eyepiece, the barrel and field lens from a 8x KPL (both LOW eyepoint eyepieces). The eyepiece is fitted as usual into the trino phototube, not "lifted". It is not parfocal with the bino eyepieces. The camera body is connected on top of the phototube via a cheap M49-1.25" telescope adapter and various extension rings. The APS-C sensor is roughly 9.5cm higher than the projecting eyepiece. The camera at this height is made exactly parfocal with the viewing eyepieces, and parfocality is maintained for all objectives. Chromatic aberration is weaker than in my previous afocal setups; pincushion is very slightly worse, but still acceptable for me, and FOV coverage is ~70%. For example, here is the image of the stage micrometer, taken with a 25x0.45 Plan achromat. Post processing included color profile (shown in a separate graph) and grey background removal. A "full hybrid" was found to be almost as good as the "half hybrid".
Notes:
1) The color profile covers only the range of dense vertical bars of the scale, not the "window frame".
2) The idea is demonstrated here https://www.microbehunter.com/microscop ... 76#p102276
Notes:
1) The color profile covers only the range of dense vertical bars of the scale, not the "window frame".
2) The idea is demonstrated here https://www.microbehunter.com/microscop ... 76#p102276