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 Post subject: 10-20mm shadow problem?
PostPosted: Sun May 24, 2009 2:21 am 
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hey everyone...well i'm loving my new 10-20mm lens..but i've noticed that when i use my Xsi built in flash in low-light situations, or at night shots, there is a shadow in the bottom of the picture? I don't think its a lens problem...but is it just because the this Sigma lens is a beast and is so huge, that it blocks the built in flash when it fires, causing a shadow?

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 Post subject:
PostPosted: Sun May 24, 2009 9:10 am 
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I think it might be a combination of obstruction, and maybe even the Sigma is such a wide angle the flash was never designed to light that wide. Remove the hood if you haven't done so already.

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 Post subject:
PostPosted: Sun May 24, 2009 2:51 pm 
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Hi Avlis,

I do not think it's an issue with the lens either.

I have the "sister lens" from Tokina (the 11-16mm) on my D40 and the same thing happens. The lens has such a wide field of view that it can see it's own shadow.

A typical external flash in your hotshoe will probably be high enough to change the angle of the light so that this shadow will no longer appear even at 10mm.

Cheers :-)


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 Post subject:
PostPosted: Sun May 24, 2009 3:40 pm 
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thx, popo and Lahlah...

well at least i know its just an obstruction problem and not a lens problem...so i guess i just g2 figure out the lens more so i don't keep getting the Sigma shadow... :wink:

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 Post subject:
PostPosted: Tue May 26, 2009 7:13 pm 
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It can be easily solved by avoidance of the pop-up and using an external flashgun.

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 Post subject:
PostPosted: Tue May 26, 2009 8:45 pm 
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I think the issue is that your 10mm wide angle is too wide for your lens. Like Photoj says, either avoid using your flash or get an external flash gun.

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 Post subject:
PostPosted: Tue May 26, 2009 9:23 pm 
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pgtips wrote:
I think the issue is that your 10mm wide angle is too wide for your lens.


Eh? Did you mean too wide for the pop-up? Surely a lens can't be too wide for its own good?

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 Post subject:
PostPosted: Wed May 27, 2009 5:31 am 
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Duh! Too wide for the popup flash. I need to stop posting when I'm too tired.

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 Post subject:
PostPosted: Wed May 27, 2009 7:59 am 
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It's a problem with most wide-angles and even some kit lenses at their widest.

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 Post subject:
PostPosted: Wed May 27, 2009 5:36 pm 
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This result is normal with the pop-up flash at 10mm:
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The other trick to avoid it (when shooting outside): turn the camera upside down so the shadow is projected into the sky :shock:

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 Post subject:
PostPosted: Thu May 28, 2009 1:31 am 
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Thomas wrote:
The other trick to avoid it (when shooting outside): turn the camera upside down so the shadow is projected into the sky :shock:


Genius!

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