Originally Posted by JJJPhoto
I'm not sure about the 31mm and the 77mm, but 43mm is the "true normal" perspective for 35mm film. That's because 43mm is exactly the diagonal length of 35mm film. With the 1.5x crop factor of APS-C sensors that probably makes a 28mm the "true normal" for our DSLRs.
Thanks for the response JJJPHoto.. I didn't know 43mm is the diagonal of the 35mm film. But isn't 50mm usually considered to be the 'normal perspective' of our vision?