is it correct that the sigma 10-20 won't fit a 1dmk2 ? or is it just the full frame 1 series it won't fit ? i was about to try it but remembered seeing something about 1 series and 10-20s
Susie is right. You need to avoid Canon EF-S, Sigma DC and Tamron Di-II lenses which will only fit cameras with APS-C sized sensors (eg 30/40/50D, 400/450/500D etc.). The Sigma 10-20mm is a DC lens.
You need to pop a bit of plastic at the back and make sure that the lens is not used beyond about 12mm and there's no mechanical reason why it won't work.
There's loads of people on Flickr who have done this for a 5d, can't remember about a 1 series though I'm affraid
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