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Old Jun 3, 2012, 10:45 PM   #1
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Default Dark Corner with Canon SX40

I've owned the camera for about 2 weeks and am very unhappy about dark corner that I keep seeing at various zoom ranges when taking a photo of the sky. I don't use any lens hoods or filters. Anyone else has it?
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Old Jun 4, 2012, 5:02 AM   #2
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Well I certainly don't have it... well not to that degree anyway..!
Vignetting can occur at full zoom- with a slight darkening of the corners- noticeable more against pale/light backgrounds- though it tends to be uniform,with equal amounts at each corner.
Here's an example taken this morning at 840mm....

Though not ideal,I can accept it given the extreme focal length on offer in one lens- and I can easily remove it in photoshop or a similar editing software.

I do,however,fear that your issue is something different- as your "dark corner" is very pronounced and at varying focal lengths- whereas my SX40 only has a slight vignetting effect at full zoom only.
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Last edited by SIMON40; Jun 4, 2012 at 5:06 AM.
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Old Jun 4, 2012, 9:20 AM   #3
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Thank you SIMON40. I had a feeling it was not normal. My dark corners are completely unpredictable and if they were like yours, I wouldn't even bother to worry. Now the good news is that the camera is still within the return period. Guess it'd going back. Thank you!

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Originally Posted by SIMON40 View Post
Well I certainly don't have it... well not to that degree anyway..!
Vignetting can occur at full zoom- with a slight darkening of the corners- noticeable more against pale/light backgrounds- though it tends to be uniform,with equal amounts at each corner.
Here's an example taken this morning at 840mm....

Though not ideal,I can accept it given the extreme focal length on offer in one lens- and I can easily remove it in photoshop or a similar editing software.

I do,however,fear that your issue is something different- as your "dark corner" is very pronounced and at varying focal lengths- whereas my SX40 only has a slight vignetting effect at full zoom only.
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Old Oct 13, 2012, 5:45 AM   #4
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Default SX40 vignetting

I notice that the dark corners appear (and change) when tipping the camera. Slight movements can almost make the corners correct. Probably something in the IS system is not right.
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Old Oct 15, 2012, 2:18 PM   #5
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I haven't noticed it in my sx40, but have read of ocasions where others have experienced this in some units. I would return it ASAP and try another one. IMHO, they are great camers, just a bad one turns up now and then.

Jess

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