2.) What size is the standard lens?

3.) Can the film in these cameras be exposed one half frame at a time, is half for sound and can the film can be rolled so the other 8mm's can be exposed in what you call a second pass if no sound is involved?

4.) If I buy 100' roll of film and if it can be spilt when processed do I get 100' of finished film or 200' and does film come in 50' rolls aaan dwould that be 100' finished?

5.) Can one modify the k-100 so the whole frame is exposed and would that be like a super-8?

Any help would be greatly appreciated. Thanks for your time.