Quote:
Originally Posted by bojan
I mounted it on my modified 8/500 Rubinar.
Because of reduced distance to sensor, the lens is working at ~ 300mm or so (will check tonight if clouds allow).
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Lovely job Bojan
You could always do a daytime check for infinity focus on a distant chimney or something.
One thing though: if that lens is an M42 mount from Pentax/Praktica/Zeiss/Zenit/etc, then its Flange focal distance should be around 45.5mm and I have to say that looking at the distance between the lens flange and the sensor in your picture that it looks VERY short. Perhaps even too short to achieve infinity focus. Maybe your lens mods accommodate for that or there is enough latitude in the lens helicoid movement and things go your way. Fingers crossed as they say.
Best
JA