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Old Aug 15, 2005, 2:41 PM   #1
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Is the Sigma SA mount a rip-off of the Canon EF mount, as stated here:

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Old Aug 16, 2005, 9:13 AM   #2
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No, it's just similar in some respects..... There are only so many ways to mount a lens on a camera body and Sigma has been making 35mm cameras for quite a while....

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Old Sep 9, 2005, 8:58 AM   #3
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Your link is gone, but the Sigma SA mount is probably electronically compatible with both Canon and Nikon though identical to neither. Why wouldn't it be when these mounts were designed in the 70's and only transfer a few bytes at a time using a computationally trivial serial protocol.
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Old Aug 6, 2006, 8:27 PM   #4
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The vast majority of the electrical connections ofthe EF mount are indeed IDENTICAL to those of the SA mount and so its actually quite a simple procedure to convert some carefully selected Canon EF lenses to SA mount.

In fact the only feature ofcertainCanon lenses that you wont be able to get working on the SA mount (On aCanon lens converted to SA mount) isIS (Image stabilisation)...At least it has'nt been possible to make it work yet.

You can oftenfind converted Canon 50mm f1.4 USM lenses floating around on ebay and there are several in the hands of Sigma owners who use them on a regular basis.



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