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PostPosted: Mon Feb 01, 2010 8:11 pm 

Thought you should be aware of the following. Though I have owned the Sigma 120-400mm f/4.5-5.6 OS HSM lens for my Canon 7D for a couple of months now, and have been satisfied with the results, somehow I got the impression that the pictures were kind of soft, definitively software than those taken with Canon lenses. I attributed that to the fact that this lens is not Canon and as such, its optical performance was lower than that of Canon lenses.

However, browsing for pictures on the Internet taken with this same lens, I saw pin sharp pictures that I could not get. So, to make a long story short, after reading a lot on Internet, I discovered that this brand-new lens has a front-focus problem.

I corrected this problem on the 7D by applying +15 point of compensation on the camera settings. Now the lens delivers high-quality, pin-sharp pictures, and I am pleased :-)

So if you own this Sigma lens for a Canon body, check it for front-focusing problems.


 Post subject:
PostPosted: Mon Feb 01, 2010 8:17 pm 
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Joined: Sun Nov 05, 2006 11:08 pm
Posts: 7962
Location: Germany
Everybody should check a new lens for front-/backfocus.
Even my brand-spanking new Nikon 70-200 VRII needed micro-focus adjustment of around +6..+8 (out of 20 max) :shock:

Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

 Post subject:
PostPosted: Mon Feb 01, 2010 9:10 pm 
You bought a Sigma lens, and expected it not to have this issue? Or at the very least, not to have to check for it?

 Post subject:
PostPosted: Mon Feb 01, 2010 10:18 pm 
You are correct Gregory, I bought a brand-new Sigma telephoto lens, and did not expect to have this issue.

 Post subject:
PostPosted: Thu Feb 04, 2010 5:58 pm 

Joined: Tue Feb 03, 2009 2:20 am
Posts: 66
Location: Parker, Colorado
You know Gregory, we all don't think of everything when we buy new lenses. I had my 50D for about a month before I realized that I could adjust the front/back focus on lenses.

You came across a little condescending there.

Canon 5D Mk II & Canon SL1 (100d)
17-40 F/4L ~ 24-105 F/4L ~ EF 70-200mm f/4L IS ~ Tamron 28-75 f/2.8 ~ EF 50 f/1.4 ~ Lensbaby Composer ~ EF 100-400 L ~ EF 100 F/2.8 Macro ~ EF-S 18-135 ~ EF 24mm f/2.8 IS
EF 1.4x Extender III ~ Speedlite 600RT & 6 430EX II's with PW's ~ Speedlight MR-14EX

 Post subject:
PostPosted: Sun Mar 14, 2010 2:48 pm 

Joined: Thu Jul 31, 2008 4:31 am
Posts: 296
I believe mine has the front focus issue. For some unknown reason my 50-250mm lens is razor sharp open wide while this lens at at 300m F6.3 is soft. It's going back today

Canon T2i (550D)- Tamron 17-50 F2.8 Non-VC, Sigma 70-200mm F2.8 EX DG OS HSM, Canon EF-S 55-250mm F4.5-F5.6

 Post subject:
PostPosted: Thu Apr 08, 2010 10:14 pm 
I corrected this problem on the 7D by applying +15 point of compensation on the camera settings

Is this something I could do on my little Canon Rebel XS and if so - how do you do it ? Sorry for my lack of knowledge here.

 Post subject:
PostPosted: Fri Apr 09, 2010 5:33 pm 

Joined: Fri Sep 25, 2009 7:59 pm
Posts: 135
Location: west coast of Norway
i believe that focus adjustment is only available in the 50D and upward models..

i probably should check my 70-200 F2.8 once but ill wait till i get a camera that can do adjustment :wink:

Canon 1D MK3, 5D MK3
Canon 50mm 1.4 USM, 100mm F2.8 USM, 70-200 F2.8 L IS II,
16-35 F2.8 L 24-105 L IS USM

Sigma 300mm F2.8

Canon Pixma PRO-9000 MKII

and a 17-40 F4L in a hundred little pieces

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