My 17-55 is tack sharp from 2.8 onwards. My 35L though is another story 
Feb 11, 2012 18:31 | #16 My 17-55 is tack sharp from 2.8 onwards. My 35L though is another story Jon | JMBPhotography
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Feb 11, 2012 18:45 | #17 Collin85 wrote in post #13870173  My old 17-55 was terrifyingly sharp wide-open, but judging from your latest post, the issue isn't sharpness but rather front-focusing. FYI, this means it front-focuses at all apertures, not just wide-open. The reason why it's much sharper at f/5.6 for you is because the DoF has increased to the extent as to blanket over the problem of having missed focus. If you're convinced it's a front-focusing issue, send it into Canon for calibration. Yeah, I know, and when it hits at 2.8 it is nice and sharp too, but when looking at other things in the frame it appears that when it hits all the way open the subject is on the very back edge of the focal plane. Cameras: 7D2, S100
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MikeG2012 Senior Member More info | Feb 11, 2012 21:51 | #18 Mine has been the same way. I did MA calculations and its at -1 at 17-35mm and +4 at 36-55mm. And its still not terribly sharp at these values at really any aperture. Would you guys suggest sending it in to Canon for calibration? Mike Glatzer Photography
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emelvee Goldmember  1,871 posts Joined Apr 2009 Location: E-town, Canada More info | DreDaze wrote in post #13870331
seriously...post some pics if you want better help... Agree. I have no problems with mine. Canon RP | Canon 6D | 70-200 f/2.8 I | 50mm f/1.4 | 16-35mm f/2.8 II | 580EX II x 2
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District_History_Fan Goldmember 2,286 posts Likes: 1 Joined Dec 2008 More info | Feb 12, 2012 10:13 | #20 MikeG2012 wrote in post #13871343 Mine has been the same way. I did MA calculations and its at -1 at 17-35mm and +4 at 36-55mm. And its still not terribly sharp at these values at really any aperture. Would you guys suggest sending it in to Canon for calibration? Under those circumstances you probably should send it in. There is really no other choice if you want the performance the lens is capable of.
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Feb 12, 2012 12:01 | #21 Doing some of the things suggested here, it looks like it is just unable to focus at the far end of the focal range. Using live view it left the targets noticeably blurry and an adjustment of the focus ring brought it in sharp. I could exchange it with the online store and keep playing the lottery, in which case I am out the return shipping, or I can send it to Canon as it is new and have this one hand examined and calibrated and repaired. Thoughts? I think my best option is to send it to Canon. Cameras: 7D2, S100
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Mar 04, 2012 19:09 | #22 Keyan wrote in post #13873649 Doing some of the things suggested here, it looks like it is just unable to focus at the far end of the focal range. Using live view it left the targets noticeably blurry and an adjustment of the focus ring brought it in sharp. I could exchange it with the online store and keep playing the lottery, in which case I am out the return shipping, or I can send it to Canon as it is new and have this one hand examined and calibrated and repaired. Thoughts? I think my best option is to send it to Canon. What did u end up doing? I just got my 17-55 refurb from the store and I'm not thrilled. R5 / EOS R / 24-70 2.8L MK II / 70-200 2.8L IS MK II / Sigma 50 1.4 Art / 430 EX II / YN 568 EX II / YN-622C / YN 622C-TX
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