>>4167777No, the focal length does not change, nothing changes, you just cut a smaller square out of the picture. How stupid does this sound? The filmy square thingy is a different size so now your lens is longer. 50mm f1.8 is 50mm f1.8 everywhere.
The only trick you need to be cognizant of is lenses made just for crop sensors can be smaller because they can cut off some of the unused image by using lens elements that are too small to make a full image circle at that focal length, so you can't use them on larger cameras. But you can use lenses for larger cameras on smaller cameras.
