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Old Feb 4, 2009, 1:21 PM   #1
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There are reports that the Sigma 70-300 strips the AF gears on Sony dSLRs.

How does it perform mechanically and optically on Canon?


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Old Feb 4, 2009, 1:53 PM   #2
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Well the first part of the question is answered. Canon DSLRs do not have focus motors in the camera so the 'stripping' is not an issue whatsoever. Optically it's a good budget lens but that's about it. It's not quite as sharp as the Tamron and far inferior to the Canon 70-300. Although the sigma IS a little better than the Canon 75-300. As you might expect from a budget zoom it's soft from 200-300mm.

It also lacks Sigma's HSM motor so focus speed isn't great. This would have the most impact for sports and wildlife shooting.

But it's $180 or so. The Canon 70-300 is $510. The canon is really a very good deal as it's fairly sharp. The canon build quality is a bit better but still plastic with external rotation during focus.

What types of photos do you want the lens for?


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Old Feb 4, 2009, 3:06 PM   #3
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Many thanks for this precise very helpful info, John.

I am an 'opportunist' street photographer. The shot is there, I take it.



With the APS-C 1.6x factor these lenses are also of interest for mid-tele range:

What are your thoughts on the Sigma 28-200 F3.5-5.6 Aspher. Macro?

And the Tamron 70-200 F2.8?
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Old Feb 4, 2009, 5:23 PM   #4
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Don't know anything about the 28-200. Chances are, like must superzooms it's not a great performer.

The Tamron 70-200 2.8 is, by most accounts, a very sharp lens. So IQ is important. I haven't heard about the build quality so don't know if they stepped up to the plate and built it as well as the Sigma or Canon (i.e. metal construction and tight tolerances). But it's sharper than the sigma version. The knock on it is it doesn't have a fast-focus motor like Sigma's HSM or Canon's USM. That is likely not much of an issue for your style of photography though. It really might be a good fit for you. 2.8 is nice even if you don't need it for high shutter speeds - it allows for some shallow-dof shots. The question becomes whether you are OK with the weight of the lens. That's a bit heavier than 70-300 lenses under discussion. So that would be the biggest drawback, IMO, for the type of shooting you plan to do.
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Old Mar 27, 2009, 9:02 AM   #5
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Love mine. A lot. For the money, the photo's are great, and the macro function is good - though I really want a smaller then 300mm macro....
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