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Hi Boastjan
Here is how I used to connect my Pentax KM 35mm film camera to my Vixen ED102S refractor for Prime Focus astrophotography.
Prime Focus means that effectively, the telescope simply replaces the camera lens and as is acting like a super-telephoto lens, in my case with a focal length of 920mm.
Prime focus is good for getting the Moon completely in the frame and with say, 100ASA film, I think for a half moon (1st or 3rd Quarter) you will need an exposure of around 1/125 sec.
Cheers
Dennis
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