Having a hard time trying to decide on a focal length? Below is an easy visual guide to the most common focal lengths, displaying the amount of a scene captured. Note these are full-frame/35mm focal lengths, so smaller sensors will require calculating equivalencies. For example the view shown for the 50mm lens below would be equivalent to what is seen by a 33mm lens on an APS-C camera, or a 25mm lens on a Micro-Four-Thirds camera. The 135mm lens view would be equivalent to a 90mm APS-C or a 68mm MFT lens.