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Old May 28, 2010, 3:05 PM   #1
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Default Sigma 12-24mm

Just picked up a 1Ds MK II. Took a test shot and noticed the upper left corner is very SOFT On my 1D MK II the softness in that corner would go away at f/13 but not on the FF body. Is this something Sigma can fix/calibrate? I really don't have the cash to replace this lens

Thanks guys!
Chris

f/13
1/100
ISO 400
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Old Jun 2, 2010, 6:12 AM   #2
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I'm not sure there's much you can do; lack of sharpness in the corners is the compromise when using this lens with a FF body. Despite its compatibility with 35mm it's "optimised for digital" which to me means crop, the 1.3 factor of the 1D probably being the limit. I read a couple of customer reviews and the gripes when using the lens at 12mm on FF are farily consistent: lack of corner sharpness, vignetting.
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Old Jun 2, 2010, 7:22 AM   #3
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Thanks Davi! The strange thing is it's just the upper left corner that is soft. I could understand of all 4 corners were soft but just 1 This photo shows the softness a bit better...

@12mm
f/8
1/320
ISO 400


Quote:
Originally Posted by Davi View Post
I'm not sure there's much you can do; lack of sharpness in the corners is the compromise when using this lens with a FF body. Despite its compatibility with 35mm it's "optimised for digital" which to me means crop, the 1.3 factor of the 1D probably being the limit. I read a couple of customer reviews and the gripes when using the lens at 12mm on FF are farily consistent: lack of corner sharpness, vignetting.
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Old Jun 4, 2010, 5:08 PM   #4
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Agreed the top left is particularly soft, but top right also looks a little soft to me - both in the mesh in the corner of the first image, and in the roof detail in the second image. Maybe calibration would help a little, but at the end of the day its midrange glass on a full format camera.
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Old Jun 5, 2010, 9:49 AM   #5
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I don't mind the right corner so much. The left is what's really bugging me

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Originally Posted by Davi View Post
Agreed the top left is particularly soft, but top right also looks a little soft to me - both in the mesh in the corner of the first image, and in the roof detail in the second image. Maybe calibration would help a little, but at the end of the day its midrange glass on a full format camera.
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