Question: can i use efs lens with 5d?
Answer: The Canon 5D Mark II will work with pretty much any EF-mount lens ever made, however it is not compatible with the special EF-S lenses designed for cameras with APS-C size sensors. ... EF-S lenses can't be used on full-frame Canon cameras, nor on their models with 1.3x crop factors, like the current EOS-1D Mark III.