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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Jul 2011 (Monday) 10:55
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Canon 10-22mm Funkiness

 
bpark42
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Jul 28, 2011 09:12 |  #16

Honestly, it's hard to say even with those shots. I have seen decentering issues many times and usually the issue tends to jump out at me. I would say that you might have a mild case here, but if so it isn't obvious to me (admittedly I am on a small laptop screen at the moment...)




  
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ktownhero
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Jul 28, 2011 09:50 |  #17

hienz wrote in post #12836902 (external link)
Any opinions with the new pictures provided?

Yes. Pictures of bricks don't win Pulitzers.




  
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hienz
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Jul 28, 2011 10:12 |  #18

bpark42 wrote in post #12837018 (external link)
Honestly, it's hard to say even with those shots. I have seen decentering issues many times and usually the issue tends to jump out at me. I would say that you might have a mild case here, but if so it isn't obvious to me (admittedly I am on a small laptop screen at the moment...)

Thanks bpark - much appreciated.


stevenhien.com (external link)
5D2 | XT1

  
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shinksma
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Jul 28, 2011 10:21 |  #19

hienz wrote in post #12836902 (external link)
Any opinions with the new pictures provided?

At normal "fill-the-screen size" on my monitor they look just fine - but that's resized to appear 1920x1200, a lot less pixels than 100%. When blown up full-size I can see the issues you are concerned about.

I only looked at four of the images so far, but:

The shot at f/3.5 does seem to have more softness on the right side of the image compared to the left (and the image certainly gets softer overall towards the corners and sides, as one might expect from such an open aperture).

The shot at f/8 seems to clear up a lot of that, and seems more even overall.

The shot at f/16 seems a little softer in the center compared to f/3.5, which makes me suspect you didn't get the focus exact - if you focused once at f/3.5 and then just changed aperture, you won't necessarily maintain focus - you have to refocus each time. If that was the case, then next time re-focus at each aperture. And the right side actually seems a bit more in focus compared to the rest of the image...which means you probably do have a decentering/focal plane issue evidenced by the right-side softness if center-focused.

The shot at f/22 is soft overall, hard to tell if one side worse than the other - again perhaps due to not re-focusing for each aperture?

At any rate, you do seem to have a very mild case, and if you are unhappy you should have no qualms returning the lens or attempting to get it serviced under warranty.

IMHO, what do I know, I'm still a newbie,

shinksma


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Snydremark
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Jul 28, 2011 10:26 |  #20

It looks like pretty 'normal' distortion from shooting at 10mm; to me. And if you're not perfectly level with your subject, at that focal length you will see this more noticeably; try notching your fl in just to 11 or 12mm and see if you still notice the same problems. Also, apply the Lens Profile correction for that lens since you have LR and see how that cleans it up for you.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
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ktownhero
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Jul 28, 2011 14:04 |  #21

Snydremark wrote in post #12837368 (external link)
Also, apply the Lens Profile correction for that lens since you have LR and see how that cleans it up for you.

Yeah. Those lens profile corrections are magic.




  
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hienz
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Jul 28, 2011 21:36 |  #22

Thanks shinksma for the thorough response. You're right - I didn't re-focus after each aperture change.

There's probably no problem with the lens since no one can spot anything obviously wrong in the images. I think Snydremark is right about the distortion. I'll pay closer attention to the horizon line and make sure the camera is leveled.

Thanks all for the help! Much appreciate.


stevenhien.com (external link)
5D2 | XT1

  
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Canon 10-22mm Funkiness
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