Originally posted by vrrattko 35mm a short tele on APS-C? That's a heavy nonsense....
Not at all. Normal focal length for APS-C is 28-30mm, depending on exact sensor size. Official APS-C has a 30mm diagonal; for my K20D it's 28mm. Normal focal length for 135/FF is 43mm, the diagonal of a full-frame -- those 50-55-58 kit lenses were recognized by shooters as being short tele. Many 135/FF RFs had 43-45mm lenses, quite normal, just as many Pentaxians see the 31 Ltd as normal on their dSLRs. 40mm lenses were also popular for 135/FF, just wider than normal; I have a couple.
There are reasons why 50-55mm lenses were standard on 135/FF SLRs:
* Without retrofocus elements, lenses must be longer than normal in order to clear the SLR mirror box. (This a problem for Canoneers using some Takumars.)
* 50-55-58mm seems to be a very easy range for designing optics, especially fast optics, hence all the classic f/1.2 and f/1.4 glass available in that range.
* MF users with 'normal' lenses had lots of image area to crop; 135/FF negatives are much smaller. With a 50-55mm lens, the shooter essentially crops in-camera.
Depending on who is talking, 35-37mm on APS-C or 50-55-58mm on 135/FF can be called long-normal or short-tele; 28mm on APS-C or 40-45mm on 135/FF can be called short-normal. I didn't just dream this up; it's in the literature. So 35mm on APS-C or 50mm on 135/FF may be familiar; but they're optically long, not 'normal'.