Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Thu Apr 17, 2014 10:45 pm

All times are UTC




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Mon Feb 01, 2010 8:11 pm 
Offline
User avatar

Joined: Thu Oct 08, 2009 5:34 pm
Posts: 407
Location: Switzerland
Hi

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.

Regards,
Luis.

_________________
Canon 5D Mark II
Canon 24-105mm f/4.0 L


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 01, 2010 8:17 pm 
Offline
Moderator
User avatar

Joined: Sun Nov 05, 2006 11:08 pm
Posts: 7896
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


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 01, 2010 9:10 pm 
Offline
User avatar

Joined: Mon Dec 10, 2007 11:34 pm
Posts: 2176
Location: Athens, Greece
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?

_________________
I've upped my Iso, now up yours.
Nikon D700, Nikon D80, Micro Nikkor 105 f2.8 AI-S,Nikon 85mm 1.8D, Nikon 50mm 1.8D, Nikon 35mm F2D, Nikon 16-35 f4 VR, Nikon 24-70mm F2.8 AF-S, Nikon 70-200VRII, Nikon 70-300mm VR, 300mm f2.8 AI IF ED, SB-800, SB-900. Noiseware pro,NIK Dfine, Nik Colour Effex, Nik Sharpener Pro


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 01, 2010 10:18 pm 
Offline
User avatar

Joined: Thu Oct 08, 2009 5:34 pm
Posts: 407
Location: Switzerland
You are correct Gregory, I bought a brand-new Sigma telephoto lens, and did not expect to have this issue.

_________________
Canon 5D Mark II
Canon 24-105mm f/4.0 L


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

Joined: Tue Feb 03, 2009 2:20 am
Posts: 62
Location: Elko, NV
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 * 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 1.4x Extender III * Speedlite 430EX II * Speedlight MR-14EX *


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

Joined: Thu Jul 31, 2008 4:31 am
Posts: 292
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
http://www.astronomyphotography.com


Top
 Profile  
 
 Post subject:
PostPosted: Thu Apr 08, 2010 10:14 pm 
Offline
User avatar

Joined: Sun Aug 30, 2009 5:51 am
Posts: 82
Location: Idaho
Quote:
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.

_________________
Larry
"Have you hugged your pet today"
-Canon EOS Rebel XS
-EF 28-135 f/3.5-5.6 IS USM
-EF 70-200 F/4 L (non IS) USM
-Canon EF-S Macro USM 60mm USM


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

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:

_________________
DeviantArt
Flickr
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


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group