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Old Jan 15, 2008, 6:47 PM   #1
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I am having a problem with my 30D. I periodically get a bright arc across the center of my image. (See attached.) It happens with various lenses, with and without the hood, and with different CF cards. It isn't consistent by the focal length, f-stop, or shutter speed either. (I can't find a consistent variable within the photos that have the arc.) Anyone seen such a thing. I did try cleaning my lenses and my mirror to see if that would help. Also, I have recently had the sensor cleaned.

I have attached a sample of the problem before.

I have compared photos, and it always seems to be in the exact same place in the image.

It hasn't seemed to happen (luckily) on studio work thus far.

Any ideas??
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Old Jan 15, 2008, 8:34 PM   #2
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If it happens with different lenses, this is obviously a problem with the sensor. I have no idea what it could be. I would send it to Canon to have it checked out, that would be unacceptable to me.
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Old Jan 15, 2008, 8:42 PM   #3
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I can't say for sure what causes that arc but I suspect it is a sensor problem. Possibly a light leak. This is based on conservations with Canon support.

My 30D developed the same arc just before it went out of warranty, however I didn't get it sent in for repair. Mine is most noticeable against a blue sky but am able to deal with that in PP. If it were anywhere else like yours is, obviouslyPP wouldn't be worth it.

Aside from the arc, do you seem to havequality issues with your images since that started? By chance, if it is still in warranty, I would get in in for repair.

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Old Jan 16, 2008, 1:31 AM   #4
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Thanks for the feedback. It IS very frusterating and unacceptable. I will check my warranty = I think it's getting close!

If it were a light leak, wouldn't the arc be dark instead of light? I am worried it's a sensor problem, as well. Was just hoping for a 'quick fix'. lol.

I will review my pictures to see if I am missing anything - but the only other problem I seem to be having (though I had chalked this up to me being in a hurry and impatient - and shooting in some situations with a very high dynamic range) is that my photos are consistently about a step dark. Nothing that can't be fixed in post-production, but maddening still.
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Old Jan 16, 2008, 7:51 AM   #5
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IF u still have the warranty please use it and send the camera to a canon service centre.

I had some issue with my 5D when the shutter will open but wont close. I sent the camera to IrvinE California, they replaced the whole shutter assembly and i practically had a new shutter after 5k actuations.

So make use of the warranty if u are still within the period
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