This is just a general question that I'm sure is not really an issue at all but maybe someone can clarify my understanding. On DSLR's which are not full frame then they can have a crop factor e.g. 1.5. When reading about this the info. this suggests that for example this would make a 50mm lens equivalent to approx. 75mm. I guess the bit that I am not understanding is that the characteristics of a 50mm lens are presumably different from a 75mm lens in construction. So, what is it exactly that you are getting when you use a lens on a camera with a crop factor? I understand that it changes the focal length. But, again that slightly confuses me because won't that have an expectation of trying to make the lens perform beyond what it was designed for? Interested to hear responses that will untangle my slightly confused thoughts about this!
Cheers for now