"Can I use that lens on a crop sensor camera?"
The answer is, yes, but even that answer has some caveats. The nice thing about owning a cropper is it can use either or, or both types, of lenses so it really doesn't mean anything to you. You see most of the naming used on lenses comes from the advertising department. They tend to get a bit lose and carried away with the words and their meaning. All lenses are full frame meaning they will show you exactly what you will get in your VF or LCD and the frame will be full. And all lenses will always be exactly what they are no matter what camera from large format, medium format, 35mm or crop sensor they are used on.
On the other hand if you own a so-called FF camera some lenses may not offer a full frame view. Most of the time they won't mount but sometimes they will. However, that doesn't mean the lens is anything different than what it says in its name. It is not. In this case since the lens can't change so what does? The focus distance that the lens offers is what is different and why it can not fill a FF sensor.
Remember a lens is a lens and will always be that lens.
EB
EOS 1DX and 1D Mk IV and less lenses then before!
