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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Mar 2010 (Saturday) 15:33
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Sigma 150-500 edge softness

 
mtran
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Mar 27, 2010 21:37 |  #16

have you tried using imageshack.us? i'm pretty sure they allow higher image upload sizes.


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CurveMan
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Mar 27, 2010 22:00 as a reply to  @ mtran's post |  #17

Trying again. Photobucket appears to limit to 800X600. I'll look into the other.

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Hope this is better. Look closely, even at this, the right side is noticeably softer to me.

Still wondering what other owners are seeing as native color and exposure characters. Mine is
definately less saturated and is about +2/3- 1 ev high at no on-camera exposure compensation



  
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Supra_t
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Mar 27, 2010 22:16 as a reply to  @ CurveMan's post |  #18

I see the softness your talking about, could be camera shake. If you have shaken the camera in a circular motion around the centre point the centre may be sharp while the outer edges of the image become more blurred.

What shutter was that shot at?


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CurveMan
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Mar 27, 2010 22:58 as a reply to  @ Supra_t's post |  #19

Tripod mounted, OS disabled, 10 sec timer release 1/400 SS.

Oh, and by the way these cliffs are about five miles distant as the light flies, so obviosuly the focus at infinity.




  
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artyman
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Mar 28, 2010 03:58 |  #20

The softness that you think you are seeing is atmospheric pollution, now stop pixel peeping and just go and enjoy the lens :)


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Ken
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CurveMan
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Mar 28, 2010 14:31 as a reply to  @ artyman's post |  #21

Ken - So sorry, but you are unfortunately, so wrong. I knew someone would suggest this. Atmospheric conditions would not vary spatially in such a narrow slice of the same topography at this elevation. There just isn't that much variability or differential heating.

Besides, the lens softness effect occurs on all the other images, regardless of content. I agree pixel peeping is problematic for mahy reasons. But not in this case where comparative analysis across a single image is the goal. Besides, everyone wanted and needed a blow up to see the details. You too Ken.

Hey though, I appreciate the contonuong dialogue. And I appreciate a chance to legitimately kick this thread back to the top for further comments !!

No, this lens is going back to the dealer in Anchorage where they've agreed to exchange it for another. I truly want a good copy of this lens. I'm looking forward to the potential of the great images I know this lens can produce (like yours, Ken). I suspect a trip to Sigma would probably collect a positive adjustment. I'll let the dealer do that, and they get to keep my business.




  
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Sigma 150-500 edge softness
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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