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Thread started 20 Feb 2009 (Friday) 21:14
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Sigma 24-70 f/2.8 EX HSM

 
phenom_1819
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Apr 02, 2012 21:59 |  #331

I just bought Joosay's 24-70... can't wait for it to show up, especially after seeing this thread!!


Cal -- Yakima, WA
calblethen.blogspot.co​m
7D, 18-135mm IS STM, 50mm f/1.8 STM

  
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Johandyman
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Apr 03, 2012 07:57 |  #332

phenom_1819 wrote in post #14200052 (external link)
I just bought Joosay's 24-70... can't wait for it to show up, especially after seeing this thread!!

yeah i just bought one too - cant wait for it to arrive :D


Johandyman.dk (external link)
"Oh, and sometimes more length isn't better" - GFWilliams

  
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Tony-S
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Apr 03, 2012 08:29 |  #333

I am very happy with this lens. Other than the vignetting on the wide end at f/2.8-f/5.6, it's been a joy to use.


"Raw" is not an acronym, abbreviation, nor a proper noun; thus, it should not be in capital letters.

  
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Johandyman
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Apr 03, 2012 08:41 |  #334

Tony-S wrote in post #14201885 (external link)
I am very happy with this lens. Other than the vignetting on the wide end at f/2.8-f/5.6, it's been a joy to use.

ive seen somewhere on the web people talking about the autofocus not beeing too good.
does this have any truth to it?


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Tony-S
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Apr 03, 2012 08:55 |  #335

The issue with this lens has been serious front focusing with the early iterations. I think I got one of the very first sold in the US and had my 5Dii's microfocus adjustment set to +18 or +20. I sent it to CRIS (in Arizona) for adjustment under warranty and it came back at +2 (within Sigma's specs of +/-5). Since then, it's been snappy and accurate. I don't think this occurs much with recently manufactured lenses but, as with all lenses, it's a possibility.


"Raw" is not an acronym, abbreviation, nor a proper noun; thus, it should not be in capital letters.

  
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Tragic_Golfer
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Apr 07, 2012 17:03 |  #336

Tony-S wrote in post #14202001 (external link)
The issue with this lens has been serious front focusing with the early iterations. I think I got one of the very first sold in the US and had my 5Dii's microfocus adjustment set to +18 or +20. I sent it to CRIS (in Arizona) for adjustment under warranty and it came back at +2 (within Sigma's specs of +/-5). Since then, it's been snappy and accurate. I don't think this occurs much with recently manufactured lenses but, as with all lenses, it's a possibility.

As a relative newbie, I went nuts and literally got all 3 sigma f2.8 zooms. I love the 17-50 and the 70-200 f2.8 but am having some issues with the 24-70. I know is not OS but wide open the auto focus is a bit hit and miss on stationary subjects. I am using centre point focus. It appears that this lens does not like anything below 1/200th shutter speed @ f2.8, and in low light that won't cut it. I have a steady hand. Does anyone else experience this? What shutter speed can you get sharp out of the hand at f2.8? Maybe I need to send it in for adjustment.


Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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Tragic_Golfer
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Apr 07, 2012 17:44 as a reply to  @ Tragic_Golfer's post |  #337

Please look at the test I did. I hope I did it right. I did 2 shots, one @f2.8 and one at f5.6 with flash. I blieve that this is an example of front focus. My focal point was the 40. Can I get this adjusted as the lens is brand new and under warranty?


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Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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phenom_1819
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Apr 20, 2012 18:46 |  #338

That looks pretty close actually. The image **appears** to be front-focusing some; however it may have something to do with the focus point. The focus point is actually slightly larger than indicated on the viewfinder, which means the camera may be catching the ribbon in front and focussing closer to the 41. To double-check, I would do a second test. Stagger three items (i.e. a chapstick tube, salt/pepper shakers, etc) in a diagonal line. Focus on the middle item. Start wide, and confirm focus -- then move them in tighter until you are confident one way or another.

This is in no way scientific, but I felt more confident doing it this way than with the tape measure.


Cal -- Yakima, WA
calblethen.blogspot.co​m
7D, 18-135mm IS STM, 50mm f/1.8 STM

  
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Tragic_Golfer
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Apr 22, 2012 02:01 as a reply to  @ phenom_1819's post |  #339

Thanks phenom. I never got any replies so I took a punt and sent it back to Sigma for Calibration. Hopefully it comes back better. I did some tests on a tripod and various shots including identica staggered items and it almost certainly is front focussing. Fingers crossed.


Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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Tony-S
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Apr 22, 2012 08:54 |  #340

It was probably good to send it in, but it is likely within spec.


"Raw" is not an acronym, abbreviation, nor a proper noun; thus, it should not be in capital letters.

  
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vivala1210
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Apr 23, 2012 21:49 |  #341

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

4-20-2012 (external link) by martin L photography (external link), on Flickr

Gear List flickr  (external link)Feedback(1) Feedback (2)  (external link) (external link)

  
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Tragic_Golfer
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Apr 24, 2012 15:02 |  #342

Tony-S wrote in post #14307679 (external link)
It was probably good to send it in, but it is likely within spec.

I hope that they can get the focus calibrated better than it is. If not I will get rid of it. It is no good to me like this. When I have used this lens, I get home and am very dissappointed with the lack of keepers due to OOF. Most close up portraits are badly OOF.


Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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tomcat7886
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Apr 24, 2012 20:24 |  #343

cute. :cool:


Canon T2i | 18-55mm IS Kit | Tamron 17-50 f2.8 VC | Joby Gorillapod SLR-Zoommmmm! | Black Canon Edition Crumpler Industry Disgrace
Crumpler on Sale: BLACK https://photography-on-the.net ...ghlight=industry+di​sgrace

  
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Tragic_Golfer
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Apr 27, 2012 20:15 |  #344

Well I got my 24-70 back from Sigma yesterday afternoon and took a couple of quick shots. It looks ok so far which is great. I really want to learn to get the best out of this lens. I have the sigma17-50 and the sigma 70-200 and I love them. I believe that the 24-70 should become my portrait lens. I know that the purests will probably say that a prime is a better portrait lens, but I do not have a studio, my pics will be out and about and a bit of zoom adds a lot of value for me. Where is the sweet spot on your sigma 24-70?


Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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Tragic_Golfer
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Apr 27, 2012 20:17 |  #345

phenom_1819 wrote in post #14200052 (external link)
I just bought Joosay's 24-70... can't wait for it to show up, especially after seeing this thread!!

Hey Phenom, how is the 24-70 going for you?


Canon 5D mkII - BG-E6 Grip, Canon 40D Gripped, Sigma 17-50 f2.8, Sigma 24-70 f2.8, Sigma 70-200 f2.8 OS, Canon EF-S 18-200mm f3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon 550EX, Canon 430EXII.

  
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Sigma 24-70 f/2.8 EX HSM
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