Really?? oooh will have to try it on the 5D i never put it on there as i was worried incase i broke either camera or lens LOL.

Are you talking about the Nikon?

I think Jack might be referring to the Nikon, not sure, as the Canon 10-20 is an EF-S lens, and EF-S lenses on Canon don't go on to EF fit bodies (unless this is something new I am not aware of)

Anyway Sam, if you wan't some natural Vignetting, you can turn of the filter on the 5D that is removing the Vignetting for you.

Alan.

I thought that i couldn't use the 10-20mm on the 5D as it is FF. I have the sigma version here. I am happy to continue using it on the 400D, if i use 100ISO and a tripod i should be fine As i will be in Aviemore i really don't want to be changing lenses when it is snowy/rainy or cold. I will be using my 70-200 f2.8 L Usm IS on the 5D mkII, the Sigma 10-20mm on one 400D body and the 24-70mm on my other 400D body. I shouldn't need any other lenses but still taking all of them with me LOL LOL.

love mine

Thats my thought too, the (Canon Fit) Sigma 10-20 is an EF-S lens designed to be used with APS-C sensors. It physically won't go on a 5D as the mount is different.

I have the 17-40 L and it's superb, on a FF sensor it is really wide, a superb lens to use, and being L series it has superb build quality and optics as well as being dust and weatherproof (I tend not to push the 'weatherproof' aspect lol)

Alan.

Ah sorry, yes.......I was referring to the Nikon fit.

Thanks for pointing it out WW

Hehe, that's okay Jack, it's sometimes a confusing issue.