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11-07-2009, 01:15 PM   #1
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Sigma 17-70 at 50mm - Very Wide Images

Hopefully this will help others considering purchasing the Sigma 17-70 DC. Not that it's at all bad, but performance certainly does peak around f/8. This test was related to my earlier thread (https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/79196-4-lenses...tml#post802020). Here is a test of performance at all stops between f/4 and f/22.

f/4


f/5.6


f/8


f/11


f/16


f/22


All are a one inch tall 100% crop to demonstrate edge to edge sharpness. Each was processed in Bridge using default settings, manual WB and exposure in camera, on a tripod, with 3s MLU.

11-07-2009, 01:46 PM   #2
Ash
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A good standardised test.
The subject is 3D no doubt? So are the corner details on the same plain as the central details?
If not it would be hard to distinguish between lens blur and gaussian (OOF) blur.

But thanks for sharing this.
11-07-2009, 10:22 PM   #3
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The extreme left side was closer to the camera than it should have been in that respect... Thanks for pointing that out, Ash! It just seems as though so many "vs" threads are very subjective. I'm not an official measurbator, though.
11-08-2009, 04:04 AM   #4
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I got the 17-70 before a trip to Samoa in may this year. Its my favorite everyday lens. I got some fantastic landscape and portrait shots.I highly recommend the lens.
John

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