How does sensor size actually affect focal length?
Focal length? Effective focal length? Actual focal length? Crop factor? Do you get more reach with a crop sensor? Is it equal to a longer focal length? There are some misconceptions surrounding what happens when a lens is used on cameras with different sensor sizes. Let’s have a look at the differences between a full frame, APS-C and micro 4/3 sensor.
Tyson Robichaud Photo-blography 