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Archive 2009 · 17-55 f2.8 Sharpness on 7d
  
 
tirrus
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p.1 #1 · p.1 #1 · 17-55 f2.8 Sharpness on 7d


Hi, got my 7d two weeks ago and last week, based on the tons of positive feedback on its sharpness I also got a 17-55 2.8 IS.

I am wondering if I'm becoming picky because I feel I may not have my money's worth with the results I get. So this morning I went out to take some shot in this wonderful setting / perfect lighting. They seem to be okay but as soon as you crop / zoom in a little. I don't blame the 7d as I got pretty decent photos with my 70-200 f4 (non-is) and even my old 28-105 II.

I usually do RAW which I process a little but I think sharpness should be better than this out of the box. For this test I posted some JPG samples as produced by the camera, unprocess.

Any advice/Comment.

My out of focus pictures ...

Photos are geolocalized in picasaweb if you're curious about the location.








Oct 17, 2009 at 07:03 PM
Ray Still
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p.1 #2 · p.1 #2 · 17-55 f2.8 Sharpness on 7d


Just a thought have you used micro adjust feature, I use it on my 1D Mark III and it really lets me dial in each individual lens

Ray Still



Oct 17, 2009 at 07:10 PM
M Vers
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p.1 #3 · p.1 #3 · 17-55 f2.8 Sharpness on 7d


There is something very wrong with those results. Test the lens again but this time mount the camera on a tripod and use LV with MF and zoom to 10x (turn IS off). Take a few frames using that method then shoot again using AF. If your results are still soft even when using MF you got a lemon. If they happen to be sharp using MF and soft using AF give MA (micro adjustment) a go using one of the many MA methods. If that fails send the lens back for a replacement. Hope that helps.


Oct 17, 2009 at 07:11 PM
tirrus
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p.1 #4 · p.1 #4 · 17-55 f2.8 Sharpness on 7d


Thanks a lot, will do that... good news... I'm not crazy.


Oct 17, 2009 at 07:13 PM
RobertLynn
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p.1 #5 · p.1 #5 · 17-55 f2.8 Sharpness on 7d


Bad all bad.


Oct 17, 2009 at 08:20 PM
philber
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p.1 #6 · p.1 #6 · 17-55 f2.8 Sharpness on 7d


Tirrus, I suggest you get on with doing AF micro-adjust forthwith. Out of the 8 lenses I adjusted, only one did not need some adjustment, and the worse ones gave results which were as problematic as yours. It doesn't take more than 3-4 mn per lens, so really, there is no reason not to do it. My personal opinion (different from Canon's) is that it is best to do MA at your preferred shooting distance with the lens you are adjusting.
Hope this helps.



Oct 17, 2009 at 08:39 PM
Gochugogi
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p.1 #7 · p.1 #7 · 17-55 f2.8 Sharpness on 7d


I've been using the 7D/17-55 combo for 9 days and it's great: sharp and nimble. I did get initially confounded by the new AF modes and thought I was getting random front and back focus. Turns out "area AF" is a bad choice for my style of shooting and by selecting individual AF points, as I do on my other cameras, nails it every time. It seems when a whole of AF points go off you never know where it actually picks focus. Even auto AF selection works better than the area AF for me.


Oct 17, 2009 at 08:40 PM
tirrus
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p.1 #8 · p.1 #8 · 17-55 f2.8 Sharpness on 7d


Thank you all -- Just finish MAing it. It turns out I had to crank it up to +15.

Going back to the same spot tomorrow morning for real comparison.




Oct 17, 2009 at 09:15 PM
stefthetoolman
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p.1 #9 · p.1 #9 · 17-55 f2.8 Sharpness on 7d


Are we now the "test and calibration" department of Canon with thoses new micro adustment features on the lastest body ?


Oct 17, 2009 at 10:17 PM
python2000
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p.1 #10 · p.1 #10 · 17-55 f2.8 Sharpness on 7d


So what's the latest thought on the issue? is it the fact that the lens and each camera have different physical relationships therefore AF is camera dependent, or is strictly the lens and it would have given bad AF on any camera?


Oct 17, 2009 at 10:28 PM
 

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philber
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p.1 #11 · p.1 #11 · 17-55 f2.8 Sharpness on 7d


stefthetoolman wrote:
Are we now the "test and calibration" department of Canon with thoses new micro adustment features on the lastest body ?


Nikon offer the same possibility, and my Zeiss lenses required no less adjustment than my Canon. So it is not a Canon "thing". I rather think it is user-driven in the ever increasing magnification of 100% crops of increasing pixel densities. So we may complain about it if we are so inclined, but clearly we are demanding more than ever before from our systems. i.e., we brought it on ourselves, and should be grateful that micro-adjustment lets us get more precise AF for free...



Oct 17, 2009 at 10:48 PM
garyvot
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p.1 #12 · p.1 #12 · 17-55 f2.8 Sharpness on 7d


My 17-55 needs a +7 MA on both my 50D and 7D bodies, and it's tack sharp on both. Other lenses needed different amounts on each body so don't automatically assume the same bias if you have more than one camera.


Oct 17, 2009 at 11:33 PM
Andrew J
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p.1 #13 · p.1 #13 · 17-55 f2.8 Sharpness on 7d


python2000 wrote:
So what's the latest thought on the issue? is it the fact that the lens and each camera have different physical relationships therefore AF is camera dependent, or is strictly the lens and it would have given bad AF on any camera?


Even if your body, lens, and TC are all at perfect calibration at room temp. The chance of them being that way on location is somewhere near zero.



Oct 18, 2009 at 02:21 PM
tirrus
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p.1 #14 · p.1 #14 · 17-55 f2.8 Sharpness on 7d


So after calibration last evening I went back on location...

Some other out of focus pictures

It turns out that this morning I had a review session planned for a photo lesson (teacher is a Reuters' photojournalist). His call, my lens is faulty.

Next step is the camera shop for a return.



Oct 18, 2009 at 03:17 PM
Alek Komarnits
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p.1 #15 · p.1 #15 · 17-55 f2.8 Sharpness on 7d


FYI: I also got a 17-55/2.8 with my 7D and my initial impressions are outstanding - sorry, don't have any images online.

I did not require any MA when I tested at 55mm.



Oct 18, 2009 at 04:29 PM
tirrus
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p.1 #16 · p.1 #16 · 17-55 f2.8 Sharpness on 7d


Alek, I'd appreciate if you could post some. I got it replaced and the new one still needed some MA (6 instead of 13) and then I am still unconvinced of the results. I'll redo some tests tomorrow and compare with a 17-40L I got from my brother to compare. The 17-40 do not need MA at all but I haven't got the chance to check in in daylight.


Oct 23, 2009 at 04:00 AM
TeamSpeed
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p.1 #17 · p.1 #17 · 17-55 f2.8 Sharpness on 7d


I use the 17-55 all the time with my 7d. It did require more MFA on the 7D than it did on the 50D prior. Different bodies have different values. I used my Focus Genie to help adjust it.

Here are a few recently taken at ISO 6400.







Larger versions here:
http://teamspeed.smugmug.com/Electronics/CS3-7D-High-ISO-Denoiser
http://teamspeed.smugmug.com/Children/The-Kids



Oct 23, 2009 at 10:19 AM
canon pants
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p.1 #18 · p.1 #18 · 17-55 f2.8 Sharpness on 7d


I have the 17-55 on the 7d and the results are very simalar to my 70-200 F4 (nonis) in terms of sharness. I am very happy with the combo.


Oct 23, 2009 at 11:18 AM
Jeff Kingston
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p.1 #19 · p.1 #19 · 17-55 f2.8 Sharpness on 7d


I have done some shooting with the 17-55 2.8 on my 7D and the results have been spectacular. I did however do an AF Micro adjust before doing any real shooting. And it took a adjustment, somewhat smaller than what I had to do on my now sold 50D, but a correction was required.

Indeed the FIRST thing I did after charging the battery, was set the camera up on a tripod, attach a cable shutter release, and go through a battery of lenses that I would plan to use on the camera and perform the micro adjustments for each lens. I think with Micro adjust that becomes standard operating procedure. And it is a beautiful thing.



Oct 23, 2009 at 05:02 PM
pentiger
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p.1 #20 · p.1 #20 · 17-55 f2.8 Sharpness on 7d


Hello, I'd like to refresh this thread.

Could you please post more results on your 7d and 17-55 lens, regarding sharpness and microadjustment?

I am having mixed results with mine.

Thanks.



Jan 29, 2010 at 06:00 PM
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