I took a photography class last year and I was thinking that my instructor told our class that there are certain kinds of lenses that have to be used on full frame cameras, such as the 5D... I could be wrong though when I think I heard this.
I currently have a 30D with a 50mm1.4 lens and a 28-135 and have been offered a 5D at a very reasonable price but I'm wondering if both of my lenses will work on the full frame.
I am also wanting to buy a wide angle lens and had rented a Tokina 12-24 for my 30D which I absolutely loved, but it seems that is one of the lenses that won't "work" with the 5D.
Am I wrong in thinking that some lenses won't work on the 5D?
Thanks in advance for any help.

