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Old May 14, 2005, 10:00 PM   #1
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I was out looking for birds today and took a bunch of pictures with the Sigma 18-125 on my XT. Some of the pictures are dark in the corners - almost like there is a ring. Never had this problem before with landscapes around town. Here is a sample of what I mean.

Any idea what caused this?

Thanks

//jim

Last edited by killdeer0007; Sep 13, 2009 at 5:10 PM.
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Old May 14, 2005, 10:54 PM   #2
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Do you have any filter on - even a UV???
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Old May 14, 2005, 10:59 PM   #3
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Just a UV but it hasn't happened before. The only difference is I'm shooting manual now instead of using the creative mode.

//jim
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Old May 14, 2005, 11:07 PM   #4
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Take it off!!! - It'll go away (just for testing)

-> Buy a 'slim-line' filter with no front thread. The reason you're seeing now is the brightness - but it is always there with that particular filter...
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Old May 15, 2005, 12:35 PM   #5
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Question for NHL - seems to be hit or miss. I tried without the filter, turns out it is a haze filter, and same result. I'm going to try shooting with the lens hood this evening. If there isn't any improvement, back to the store.

Thanks for the suggestions.

//jim
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Old May 15, 2005, 2:46 PM   #6
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i would not have thought the 18-125 sigma would need a low profile filter... but it appears to be so... hmm...
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Old May 15, 2005, 6:40 PM   #7
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Ya, at the 18mm end it is getting dicey, my Tamron at 19mm can see my hoya ultra polarizer and it is very thin. It shows up as light falloff in two opposing corners.

Peter.
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Old May 15, 2005, 9:47 PM   #8
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I think I may have stumbled on to a solution to the problem. Tonight I took some test pictures at 125mm with and without the lens hood. The lighting wasn't the best , but it gives you a good comparison - and a shot of downtown Calgary from Nosehill Park.

Here is the picture with the hood and the next post will be without the hood.

//jim

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Old May 15, 2005, 9:49 PM   #9
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Wow! I can't believe how brutal the shot looks. Oh well, it's just a comparison.

Last edited by killdeer0007; Sep 13, 2009 at 5:10 PM.
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