Full Frame Lenses on EOS?

[Airwolf]

I've tried to do some reading about this but I am still very confused. Not being a photographer i still do not understand alot about SLR's. My father has quite a few very expensive canon lenses from his older SLR film camera (not sure on the specifics). However, since it is not EOS, these would not exactly work very well on the 7d, t2i, correct? Or if they were attached then there would be some cropping around the edges unless it was zoomed in. But these would work on the 5Dmk2? So is there any huge disadvantage to not having full frame, other than that it uses different lenses, and can i use full frame lenses on the eos cameras? Thanks.

[Janke]

You can use full frame lenses, withous ome automatic functions, but consider the 1.6 cropping factor, a 50 mm lens on a T2i would be equivalent to an 80 mm on a full frame SLR. So, they're more "tele" on a C-sized digital camera.

[Kin Lau]

My father has quite a few very expensive canon lenses from his older SLR film camera (not sure on the specifics). However, since it is not EOS, these would not exactly work very well on the 7d, t2i, correct?

Keyword here is EOS. If they are not EOS, then don't bother. They're probably FD or FL mount lenses which are not compatible. Even with an adapter, they don't work well (they work, just not well).