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Canon 10D and Sigma lenses

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Roman Groszek

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Does anybody know about problems with using Sigma lenses with 10D ?

I have Sigma 28-70/2.8, and sometimes my pictures are not properly focused. I know about focusing problem with 10D, but this is not the case - I think that it is problem of lenses.
Any ideas ?
 
Roman,

I have the Sigma 24-70 f2.8 EX lens and its fine. Do you mean the images are soft or out of focus?

IV
 
in my experience, problem lenses are fairly consistent (i've returned 3 sigma lenses - all 28mm f1.8 - for serious, consistent backfocus), and intermittent problems are more camera-licious.

but yeah - we're going to need more information if we're gonna help.
Roman Groszek said:
Does anybody know about problems with using Sigma lenses with 10D ?
I have Sigma 28-70/2.8, and sometimes my pictures are not properly
focused. I know about focusing problem with 10D, but this is not
the case - I think that it is problem of lenses.
Any ideas ?
Click to expand...
--



duckypics @ http://www.theduckpond.com
 
I've been using the same lenses with Canon 1V, with excellent results.

Images from 10D are sometimes sharp, but sometimes out of focus (not soft). Does it depend of focal length ?
 
Does the lens predate the camera?

There were problems with the Sigma lenses and the Rebel D when that came out. The explanation seems to be that Canon does not release their autofocus specs and so the companies reverse engineer them. When Canon update their specs it can cause problems.

Whether this is an urban legend or even related to your problem, I do not know, but it received a lot of attention when the Rebel D came out.

When the 20D is available, I will probably sell the lenses I have with my Rebel 2000 (both sigma) and get some new ones. I am particularly interested in the Canon 10-22 mm digital lens.
Roman Groszek said:
I've been using the same lenses with Canon 1V, with excellent results.
Images from 10D are sometimes sharp, but sometimes out of focus
(not soft). Does it depend of focal length ?
Click to expand...
 
are you in 1-shot mode or AI focus?

are you placing the selected focus point (i assume you have a single focus point selected) squarely on a target? its actual focus field of view is slightly larger than the square - backfocus can occur if it's not squarely planted, just by virtue of it "seeing" something behind what you think it's seeing.

and what are your shutter speeds? remember - with the 1.6 factor they have to be almost double what they where on film.

and remember the focus lock occurs when the green light flashes, not when the square flashes - you could be flipping the shutter before it has acheived a lock.

once you're sure each of these isn't an issue, then it's time to really take a look at the lens.
Paul Charlesworth said:
There were problems with the Sigma lenses and the Rebel D when that
came out. The explanation seems to be that Canon does not release
their autofocus specs and so the companies reverse engineer them.
When Canon update their specs it can cause problems.

Whether this is an urban legend or even related to your problem, I
do not know, but it received a lot of attention when the Rebel D
came out.

When the 20D is available, I will probably sell the lenses I have
with my Rebel 2000 (both sigma) and get some new ones. I am
particularly interested in the Canon 10-22 mm digital lens.
Roman Groszek said:
I've been using the same lenses with Canon 1V, with excellent results.
Images from 10D are sometimes sharp, but sometimes out of focus
(not soft). Does it depend of focal length ?
Click to expand...
Click to expand...
--



duckypics @ http://www.theduckpond.com
 
Roman Groszek said:
Does anybody know about problems with using Sigma lenses with 10D ?
I have Sigma 28-70/2.8, and sometimes my pictures are not properly
focused. I know about focusing problem with 10D, but this is not
the case - I think that it is problem of lenses.
Any ideas ?
Click to expand...
I've had four Sigma lenses that I've tried with my 10D, my D30 and my Rebel D. All of them failed to focus consistently. Some shots would be just fine, others unsatisfactory. I honestly think the focusing motors in the Sigma lenses are not smooth enough and fast enough to work with the Canon system. I've never had focusing problems with any of my Canon lenses. Now I will admit that all four of those lenses were consumer lenses not their high end pro level lenses. Those lenses are surely a better choice.

That said, I have three Sigma lenses I use with my Pentax *istD and find they focus accurately every time. The Pentax has its own focusing motor in the camera, though. Honestly, the only lens I have problems focusing with on the *istD is a high end Pentax brand prime lens. The sigma lenses are perfect on it.
--
Dave Lewis
 
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