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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Jan 2013 (Thursday) 23:32
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17-40 centering issue with image samples - normal or faulty?

 
robonrome
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Jan 24, 2013 23:32 |  #1

I bought a second hand 17-40 and it is soft on the left side most noticeably at the long (40mm) end even stopped down to F8/F11. I posted a few days back on this, but wasn't in a position to post images then, but now can.

I took the same view at 40mm and f8 with the camera held normally and the camera held upside down to test that there definitely is a softening on one side of the lens - shows up in the first shot and the second is sharp as this is the other side of lens (held camera upside down). These are only 50% crops so the problem can be easily seen without much blowing up. The softening extends a quarter of the way into the frame.

Is this really "normal" for this lens as some have suggested to me or would you regard this degree of de-centering as faulty?


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basketballfreak6
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Jan 24, 2013 23:46 |  #2

i don't think it's normal for any lens to have one side sharper than the other, particularly with the 17-40 by f8 you should have full frame sharpness

i had the exact same problem with my brand new 70-200 2.8 II, left side softer than the right/center, i sent my to canon for evaluation, i think you should too


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robonrome
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Jan 24, 2013 23:58 |  #3

basketballfreak6 wrote in post #15531012 (external link)
i don't think it's normal for any lens to have one side sharper than the other, particularly with the 17-40 by f8 you should have full frame sharpness

i had the exact same problem with my brand new 70-200 2.8 II, left side softer than the right/center, i sent my to canon for evaluation, i think you should too

thanks, bad luck with your 70-200mk2, at least with that one I have corner to corner sharpness even at 2.8. I see you're in Brisbane, me too (well when I'm not travelling as now)... how/where did you send it to Canon? I have the problem of course that this is a second hand lens with no warranty, but it may still be worth it.


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basketballfreak6
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Jan 25, 2013 00:48 |  #4

robonrome wrote in post #15531032 (external link)
thanks, bad luck with your 70-200mk2, at least with that one I have corner to corner sharpness even at 2.8. I see you're in Brisbane, me too (well when I'm not travelling as now)... how/where did you send it to Canon? I have the problem of course that this is a second hand lens with no warranty, but it may still be worth it.

had to send it to Canon service centre in Sydney, North Ryde, just send the lens down with your contact details and description of problem and they will look at it, should be ~50 bux just for inspection/quotation etc but obviously more if needs further work done

but the fact that you bought it 2nd hand and have no warranty drop it into anderson's in capalaba i believe they do free quotations, probably end up cheaper since you save the shipping as well and you can decide if repair fee is worth it...how much you pay for it 2nd hand mate and maybe contact seller and see what he/she has to say?

anderson's used to be authorised repairs for canon i believe before canon decided to move all back to sydney but they still deal with CPS so they should be more than trustworthy


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robonrome
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Jan 25, 2013 01:05 |  #5

basketballfreak6 wrote in post #15531108 (external link)
had to send it to Canon service centre in Sydney, North Ryde, just send the lens down with your contact details and description of problem and they will look at it, should be ~50 bux just for inspection/quotation etc but obviously more if needs further work done

but the fact that you bought it 2nd hand and have no warranty drop it into anderson's in capalaba i believe they do free quotations, probably end up cheaper since you save the shipping as well and you can decide if repair fee is worth it...how much you pay for it 2nd hand mate and maybe contact seller and see what he/she has to say?

anderson's used to be authorised repairs for canon i believe before canon decided to move all back to sydney but they still deal with CPS so they should be more than trustworthy

thanks for the tip on Andersons. I'm travelling in Thailand at the moment and bought the lens second hand from a shop in Bangkok - paid around $550AU. With my travels I'm unlikely to get the opportunity to get back there so may just have to deal with it back in Australia.


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basketballfreak6
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Jan 25, 2013 01:56 |  #6

robonrome wrote in post #15531132 (external link)
thanks for the tip on Andersons. I'm travelling in Thailand at the moment and bought the lens second hand from a shop in Bangkok - paid around $550AU. With my travels I'm unlikely to get the opportunity to get back there so may just have to deal with it back in Australia.

bugger that's a shame, well hope it won't be too expensive when you do get a chance to get it looked at


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robonrome
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Jan 27, 2013 06:07 |  #7

a postscript. I did manage to get back to the shop I bought the lens from. They let me exchange for a full refund on a new 17-40L...cost me a couple of hundred more, but the new one seems much more balanced across the frame.


rob - check my galleries at http://hardlightimages​.zenfolio.com/ (external link)
Zenfolio coupon discount when signing up - 93R-NCK-DUT
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ejenner
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Jan 27, 2013 17:32 as a reply to  @ robonrome's post |  #8

I had the same issue with my used 17-40 (but actually at the wide end), but never noticed it until I put in on a FF (18 months after I bought it). I think it is a not-unusual problem with this lens, mine cost me a couple of hundred dollars to fix.

Mine is still not exactly 100%, but good enough, and I sent it back in twice. You might want to check the new one as well as you can, I know it's hard in 'normal' shooting and taking pics of brick walls seems silly.


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robonrome
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Jan 27, 2013 23:50 |  #9

ejenner wrote in post #15540943 (external link)
I had the same issue with my used 17-40 (but actually at the wide end), but never noticed it until I put in on a FF (18 months after I bought it). I think it is a not-unusual problem with this lens, mine cost me a couple of hundred dollars to fix.

Mine is still not exactly 100%, but good enough, and I sent it back in twice. You might want to check the new one as well as you can, I know it's hard in 'normal' shooting and taking pics of brick walls seems silly.

not sure the new one is perfect, but it seems good enough in normal use and waaaayy better than the other one so I'm content. sending stuff back is not an easy option in my case... even when back in Australia I have to post or courier off to another city.


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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17-40 centering issue with image samples - normal or faulty?
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