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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Jan 2013 (Tuesday) 04:46
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Border performance of the 17-40L at the longer end?

 
robonrome
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Jan 22, 2013 04:46 |  #1

I picked up a second hand 17-40L passing through Bangkok and am using it on my 5D3. I had a bit of a play with it in the shop and thought it was pretty sharp and it is in the centre. Looking at photos I've been taking in my travels (still on the road so not well placed to post any) I've found the corners lack any real sharpness at 17mm until I stop down to around F9 and F11 for decent sharpness. Actually I expected that for the wide end, but I didn't expect the substantial border (and not just the extreme borders) softness I get at the long 40mm end... I'm worried there might be some sort of misalignment as I find softness on the left side when focussed on infinity and on the right side when focussed on close objects. Again I need to stop down to around F11 to even this out, but by then it's as much at the expense of centre sharpness as uplift on the borders.

Anyone else experience something like this or think normal? Unfortunately no chance to take it back so I either live with it or get is serviced?

thoughts?


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TaDa
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Jan 22, 2013 06:39 |  #2

Both copies that I owned were soft in the corners. I'd say it's normal, but would need to see pics to be sure.


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JustinPoe
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Jan 22, 2013 10:30 as a reply to  @ TaDa's post |  #3

Your 17-40L sounds to be performing like all of them do, great in the center when stopped down, never really great in the corners.


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LeeRatters
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Jan 22, 2013 11:13 |  #4

Mine is much better in the corners when shooting at hyperfocal which is what I normally do for landscape/coastal & UE. I thought mine was soft when I first got it & tried using it like I did my 24-105L which was to focus on the foreground fence/gate/rock etc I found that because it that much wider the foreground was simply falling in front of the DOF hence soft looking.

Not saying that's your issue as you haven't shown any examples. But that was my findings.


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pdrober2
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Jan 22, 2013 20:07 |  #5

LeeRatters wrote in post #15519989 (external link)
Mine is much better in the corners when shooting at hyperfocal which is what I normally do for landscape/coastal & UE. I thought mine was soft when I first got it & tried using it like I did my 24-105L which was to focus on the foreground fence/gate/rock etc I found that because it that much wider the foreground was simply falling in front of the DOF hence soft looking.

Not saying that's your issue as you haven't shown any examples. But that was my findings.

this was my experience as well. i prefer to blame the gear, rather than the guy pushing the buttons.


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robonrome
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Jan 23, 2013 08:57 |  #6

thanks all. I'm not to concerned about the soft corners at the wide end as stopping down seems to fix this as I'd expect from the reviews I've read. What worries me is softness on one side at the long end 40mm, either left side for infinity focus or right side for min focus distances? does this sound normal? I've been using it more today and coming to the conclusion it doesn't much affect my real world shooting, but it's definitely there for that 40mm end for anything at a wider aperture that say F8.


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Jam.radonc
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Jan 23, 2013 10:43 |  #7

Unfortunately it's the lens. I prefer to use it just before the 40mm mark. Nice lens nevertheless. Kinda regretted selling that to a friend.


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CanonYouCan
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Jan 23, 2013 10:55 as a reply to  @ Jam.radonc's post |  #8

Why bother, i'm a Canon L "fine quality collector" but all Canon zooms are not sharp in the corners, that's why some get the Zeis 21mm or wait (for the probably crazy expensive 14-24)
For the sharpest/fastest/fair priced uwa zoom get the Tokina 16-35 2.8, it's as good as Nikons world changing 14-24 BUT affordable, think 1/3rd of the price.

This is the reason not staying with Canon for UWA zoom only bw!
Some nag it doesn't accept filters, but it has a built in metal lens hood, i care about the IQ ;)


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robonrome
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Jan 23, 2013 18:32 |  #9

Jam.radonc wrote in post #15524219 (external link)
Unfortunately it's the lens. I prefer to use it just before the 40mm mark. Nice lens nevertheless. Kinda regretted selling that to a friend.

thanks, I'll have to try that. The way it is at 40mm it's useless for landscape where you want corner to corner sharpness. it is really quite soft even 20% in from the left side and even at F11.


rob - check my galleries at http://hardlightimages​.zenfolio.com/ (external link)
Zenfolio coupon discount when signing up - 93R-NCK-DUT
_______________
Canon 5D Mkiii; Sony RX100; Lumix G5; 17-40L; 24L TS-E F3.5 Mk2; 24-105L IS; 40 F2.8; 135L; 70-200L F2.8 IS MkII; Ext II 1.4x; 580 exII; 270 ex... other filtery stuff:)

  
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Border performance of the 17-40L at the longer end?
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