Sigma 10-20

I believe that the lens is EF-S (does it have a white or red locator dot? White is EF-S)
In which case, it will definitely not work with the 5D (EF only), and I am pretty sure the 1D is EF only too.
 
It won't fit a full frame.

It seems to to be a common reason why people are selling these on.
 
I use mine on the 1D without too much issue... between 10mm-12mm there is vignetting but because the lens was designed to fit nikon's 1.5x crop you can get an extra mm of focal length using the camera on a 1d without heavy vignetting, (1mm is quite a difference in Field of View at these low focal numbers). So personally, it's actually made it more usable rather than less useable on a 1.3x factor... with a full frame it would be a different story for me if I'm honest.
 
Thanks for the info :)

Thats a real shame to have to sell the lens when I upgrade as a) I only just bought it lol and b) its such a fantastic lens for creative shots :(

On the positive side, I doubt you'll have much trouble selling it. They seem to go fairly quickly on here :D
 
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