> If Sigma reverse-engineers, they get left behind sooner than Canon'sown products, because they cannot know what points of aspecificationin the Canon products are significant. But even Canon products will eventually get left behind due to innovation.
Henning
There is innovation and deviousness. Who is to say Cannon are not reverse engineering Sigma's hack to find flaws which will render Sigma's lenses incompatible with the next model :).
Seriously, it's wearing a bit thin that it's happening "by accident". Sigma are doing the best they can FOR THE CUSTOMER. Canon sells cameras on the back of Sigma's lenses so it's crass of them not to cooperate.
That said, I would never buy another Sigma lens: I bought three (false economy) early on, sold one, another went phut and the 3rd I couldn't sell for any price. The quality (according to magazine tests) of my remaining Sigma was as good as Canon. The quality from my own photos, compared to a replacement Canon, bears no comparison. Canon stuff is simply better (and even holds some S/H value).
B
I've come to the same conclusions. The only Sigma lens I bought in the last while was the 12-24 because Canon didn't have anything like it. It now is a 12-17mm lens, as that is the only part of the range in which the lens will stop down. Optically, my sample is great; it's better than my 16-35 in the overlapping focal lengths (or was, when I could still use the 16-24mm range on the Sigma fully).
The final conclusion is once again, the Sigma lens is too inexpensive to have had proper QC done, and too expensive for the quality you do get.
Whether or not Canon does this stuff deliberately doesn't interest me particularly. I knew that the 12-24 would be used only until Canon came out with a similar focal length. I'd just hoped it would last a bit longer than it has. Oh well. I'll get it fixed.
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