Canon EF versus EFS Lenses

[markc]

To put what Mike was saying another way, there is no actual multiplications going on. You only do that if you are used to shooting with a 35mm camera and want to get an idea of what the lens is going to behave like. A 50mm is still a 50mm lens, no matter what camera it's on. On a disc, APS, instamatic, or 350D, a 50mm lens is a telephoto. On a 35mm film camera or 5D, it's a normal lens. On a medium format camera, it's a wide angle, and on a 4x5, it's an ultra-wide.

There is no difference between focal lengths when comparing EF and EFS lenes. It's just the EFS can be built smaller, so it's easier to make them wide angle.

 

[964]

Basically - DON'T BUY EF-S LENSES IF YOU THINK YOU WILL UPGRADE YOUR BODY AT SOME POINT!