- Oct 28, 2016
- Real Name
You cannot change the FL. The problem arises from the final optics making an image circle to fit 35mm film. so you are effectively putting a 20" tyre on a 10" wheel! The optical part can be counteracted in part by a "focal reducing" adapter AKA metabones etc. It doesnt change the focal length as the name suggests but gives a similar effect by rearranging the image circle to fit the smaller sensor.