Frage von edi_the eagle:
If I want to buy a normal lens for the Canon 7D, do I have because of the Cropfaktors a 35mm or 50mm as a search but with my old film SLR?
Supplementary question: is there among the Canon EF-S lenses, which were used for the APS-C sensors developed the Cropfaktor or you can even look at where the focal as in classical photography '
Thanks for the clarification
Antwort von Bernd E.:

If you have the impression Picture a 50mm lens-KB-like, then theoretically a hang-31mm Lens s.der 7D. Since it is not this, you remain 30mm or 35mm as alternatives. The normal 50mm lens would s.einem APS-C Tele-housing on the other hand to the portrait of 80mm (only based on the image result, of course, because the actual focal logically remains the same).
In the EF-S lenses are the Canon, regardless of the actual focal Cropfaktors. A zoom from "17mm" gives you that about the wide-angle image of a 28mm-Optics s.einer KB or Vollformatkamera.