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Old Nov 22, 2004, 8:03 PM   #1
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HI,

I bought a brand new Canon 20D and I have a Sigma 28-70mm f2.8 EX, and I am having focus problems as soft focus as well. I am loosing some pictures cuz of out of focus in very good light situations, I mean under sun light, easy focus! Does anyone had same problem ?



thanks,


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Old Nov 23, 2004, 1:27 PM   #2
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I have a 20D with a sigma 12-24. No issues. I also have a sigma 18-125 which has gone back to Sigma for "a new circuit".

So, contact Sigma and see if they know anything. Also, borrow another lens (from a shop if no where else) and see if the camera is bad [not likely, but possible]

Alan
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Old Nov 23, 2004, 1:44 PM   #3
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the camera is fine, I also have the Canon 70-200 L F4, and those sigmas you have are the new ones, I think already prepared for digitals ! I saw a review the guy with same problem with this specifically sigma and 20d, but I don't know if it's true. I sent and e-mail to sigma, but no answer until now !
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Old May 4, 2005, 12:57 PM   #4
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I've got exactly the same issue. I have Canon Rebel XT & Sigma 24-70 EX. The autofocus is soft and blurry.

I used this lens with my previous Canon Elan 7 with no issues at all.

Is it an issue of the camera or is it compatability problem?
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Old May 4, 2005, 12:59 PM   #5
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could you possibly provide a link to this review? thanks
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Old May 4, 2005, 10:55 PM   #6
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Could you two please provide some examples of the soft/blurry pictures that you are talking about? If you can also post them showing where the focus point was it would be really helpful.

Bob
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Old May 5, 2005, 11:42 AM   #7
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thanks for answering

Here is a perfect example of what i'm talking about:
http://s87148266.onlinehome.us/temp/_MG_0390.JPG
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Old May 5, 2005, 11:52 AM   #8
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That picture is taken at the 24 mm setting and at F4 check withhttp://www.dofmaster.com/dofjs.htmlfor the working Depth of Field.

At those settings and focused at 10 feet you have a9.49 foot acceptable DOF, 2.85 feet in-frontof your focus point,6.64 behind the focus point. Everything else will be blurred.

At this distance and F16 you would have a infiniite DOF from 3.85 feet on out

Peter.


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Old May 5, 2005, 12:04 PM   #9
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Having trouble posting so making 2 posts,

I can't tell what your focus point was in that image :?,

I have not heard of rebelXT's having the back-focus problem but it is a remote possibility. If this is the case the camera and lens needs to visit Canon repair for an "adjustment" of some kind. Though I don't know if Canon would take a non-canon lens for this adjustment.

Peter.
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Old May 5, 2005, 12:51 PM   #10
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exactly -- this image doesn't have any visible focus points. Though it suppose to have at least one :-)

The picture was shoot with autofocus on. As far as I remember the focus point was on one of the plant's leaves.

The light is perfect and still the image is all blurry :-(
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