Don't forget that any film camera lens is equivalent to a focal length of x1.5 on a digital camera alternative.
Sorry, but no it isn't. What you see is a crop factor that shows a field of view which is approximately equal to that of a lens 1.5x the focal length on a 35mm camera. There is no telephoto gain. A 50mm lens is a 50mm lens no matter what camera it's on. It's all down to the size of the sensor in the DSLR.
Sorry but your totally wrong, if you take a 50mm lens that is / was designed for a film slr or a full frame dslr then yes the lens will still be 50mm but stick that same lens on a dslr with a 1.5 crop factor (Nikon) and that 50mm lens becomes a 75mm lens,if you put it on a Canon which has a 1.6 crop factor it will become a 80mm lens if you were to us it via an adaptor on to the olympus 4/3 system which is a 2 x crop factor that lens will be not 50mm but 100mm. but if you by lenses that are designed for APS-C size sensors then the crop factor either 1.5, 1.6, 1.7 2.0 is already factored into the lens design. but if johndrew takes him old Minolta mount lenses and puts them on the Sony Alpha range of cameras the focal lengths WILL be X 1.5. so prime lenses will become 28mm = 42mm 35mm = 52.5mm 50mm = 75mm 100mm = 150mm 135mm = 202mm a typical zoom lens will become 70 - 210mm = 105 - 315mm
Please do not post such rubbish. You obviously do not have the smallest idea what you are talking about. I have not looked at your link because I do not need to. Just get it into your head THERE IS NO FOCAL LENGTH GAIN. Just an image that covers a smaller field of view. If you do not believe me do this: Place two cameras side by side, one 35mm film and one DSLR. Fit each with the same focal length lens and photograph the same scene. Process the film and scan the negative. Crop it to the same size as the digital image. You will have identical photos. The digtal image will be the same as the 35mm. No focal length gain. So please don't continue to misinform.