Canon EOS 300鏡頭

100% Sure can work for "ANY" digital DSLR... MarkII D3, 350D, 5D, 40D... all Canon DSLR also can use...
Or let me say that... Canon lens "EF" series for digital and 菲林相機, "EF-S" model lens for digital DSLR only... If you use EF-S lens for 菲林相機, being some Canon DSLR must need to x1.6 or X1.3 distance (some Full film is X1, same as 菲林相機), if you use the lens EF 80-200 on the DSLR will be 128~320mm (x1.6), If you use EF-S lens 80-200 for 菲林相機, you will see 黑角 at 80mm