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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 12 Feb 2013 (Tuesday) 14:59
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Sigma 30 mm f/1.4 Ex Dc HSM - Possible issues

 
mwsilver
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Feb 12, 2013 14:59 |  #1

I just got my new Sigma 30 mm f/1.4 today from B&H. Still testing, but I may have some issues with it.

I did the battery test with five AA batteries touching and photographed them at various angles at f/1.4 and f/3.2. I focused on the middle battery but the one slightly behind it seemed a bit more in focus. With such a narrow depth of field, the two front ones were way out of focus. At f/3.2 the back focusing was still slightly noticeable but a lot less obvious, I suppose due to the greater DOF. Will play with this some more and provide examples when I have more time.

I also noticed that at f/1.4 there seemed to be much more of a halo effect or perhaps its CA around objects such as the white printing on a black lens. This was very noticeable at a 100% crop, but much less so when viewing images full screen on my 23" monitor. At around f/2.2 this seemed to go away.

The real question to me is if i have issues does it make more sense to send it back and get a new copy from B&H or send it to Sigma for calibrate it. The next one from B&H could also have issues. Will Sigma properly identify and fix issues with this lens? I've generally heard good reports. I just spoke to them and they said I don't have to send in the body, although some people seems to. Any thoughts?


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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05Xrunner
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Feb 12, 2013 15:04 |  #2

instead of taking pics of batteries lined up in a row that you normally never would. Walk around and take pics of things you actually would photograph and then judge the lens by those photos


My gear
Canon 7D Mark II, Canon 35 f2 IS, Sigma 50 1.4 EX, Canon 100mm f2, Tamron 70-200 2.8 G2, Sigma 150-600 C, Shanny SN600C flash, Tascam DR-05 v2
Fuji X-T1, Fuji X-T2, Fuji 18-55 2.8-4 OIS, Fuji 35 f2, Fuji 55-200 3.5-4.8 OIS
Sony RX100 II

  
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mwsilver
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Feb 12, 2013 15:09 |  #3

05Xrunner wrote in post #15602853 (external link)
instead of taking pics of batteries lined up in a row that you normally never would. Walk around and take pics of things you actually would photograph and then judge the lens by those photos

I know. I''m trying both. Since this lens hostorically has had so many QC issues I may just be looking for problems.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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05Xrunner
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Feb 12, 2013 15:11 |  #4

yea thats another problem..a lens gets a rep that some have issues..then as soon as other get it they nit pick the lens till it falls apart and they find something. you look long and hard enough you will find faults


My gear
Canon 7D Mark II, Canon 35 f2 IS, Sigma 50 1.4 EX, Canon 100mm f2, Tamron 70-200 2.8 G2, Sigma 150-600 C, Shanny SN600C flash, Tascam DR-05 v2
Fuji X-T1, Fuji X-T2, Fuji 18-55 2.8-4 OIS, Fuji 35 f2, Fuji 55-200 3.5-4.8 OIS
Sony RX100 II

  
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melauer
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Feb 12, 2013 15:16 |  #5

Those both sound normal to me. Are you sure that the batteries are farther away than the minimum focusing distance of the lens? If so then perhaps your copy of this lens back-focuses a bit. Since your cameras do not support Microfocus Adjustment to correct for the back-focusing you might want to have Sigma deal with that.

A bit of CA at f/1.4 in a high-contrast situation (white text on black lens) seems normal for, well, any lens. If you think there is an abnormally large amount of CA perhaps you should post some photos of the problem.




  
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jeremytf
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Feb 12, 2013 16:20 as a reply to  @ melauer's post |  #6

Doesn't sound that bad. Post the pics for better feedback.


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BukvaMan
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Feb 12, 2013 23:13 as a reply to  @ jeremytf's post |  #7

I just recived mine today and even tough i havent done any crazy focus testing, i did take some shots around the apartment and they seem very accurate to me so I'am very happy. I actually love the lens. It looks and feels very well built and i also recived the latest design of it which i prefer much more then the original style. The only thing is that it doesnt focus as fast in low light like my 15-85 usm but usually it is very quick. Cant complain, for 289 shipped to my door its amazing :) also 1.4 compared to canons 1.8 makes more difference the one would think.




  
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mwsilver
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Feb 13, 2013 00:05 |  #8

05Xrunner wrote in post #15602853 (external link)
instead of taking pics of batteries lined up in a row that you normally never would. Walk around and take pics of things you actually would photograph and then judge the lens by those photos

Tests can be useful to pinpoint exactly where the issues are. I used this test chart to confirm what I already thought I was seeing in my pictures. http://www.dphotojourn​al.com/focus-test-chart.pdf (external link) The batteries were only a few of several hundred pictures I took today.

Based on the results below It seems my copy is not front or back focusing, but does seem to be decentered. The right side is much sharper than the left and very obvious when viewing this picture on Flicker at 2048. Take a look if you have a chance. But the question is am I looking for too much perfection or is the decentering serious enough to warrant getting a new lens which could end up having its own front or back focusing issues. Or if its not that bad, should I consider living with it for a while and sending to Sigma. Can they even fix decentering issues? I wonder. The softness in the center is noticeable at f1/4 to F/2.0, I think due to the decentering. The center is pretty sharp at f/2.8 and very sharp by f/4 although the edges don't really start to get as sharp until around f/4.

IMAGE: http://farm9.staticflickr.com/8387/8470288540_d33f55c52b_b.jpg
IMAGE LINK: http://www.flickr.com …/75627613@N05/8​470288540/  (external link)
IMG_5588 (external link) by mwsilver (external link), on Flickr

Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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05Xrunner
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Feb 13, 2013 06:59 |  #9

test like these I am sorry but end up always making you 2nd guess if its ok. I think they do nothing more then that. use the lens in real world shooting and judge from that not some paper laying on the table.


My gear
Canon 7D Mark II, Canon 35 f2 IS, Sigma 50 1.4 EX, Canon 100mm f2, Tamron 70-200 2.8 G2, Sigma 150-600 C, Shanny SN600C flash, Tascam DR-05 v2
Fuji X-T1, Fuji X-T2, Fuji 18-55 2.8-4 OIS, Fuji 35 f2, Fuji 55-200 3.5-4.8 OIS
Sony RX100 II

  
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little ­ johny
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Feb 13, 2013 12:01 |  #10

I would increase the shutter speed and give the test chart another try. I think the 30mm is prone to ghosting at wide open. So, quite possible you have more light on the blurry side ??

Also, I think if you take a shot at your lens box, on the white text with black background, if the ghosting is minimal under good lightings, then you have good optics. Then you can concern about the focus after the optical quality is confirmed first??? I do no see any problem with the picture you post.




  
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Lexar
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Feb 13, 2013 16:24 |  #11

05Xrunner wrote in post #15605032 (external link)
test like these I am sorry but end up always making you 2nd guess if its ok. I think they do nothing more then that. use the lens in real world shooting and judge from that not some paper laying on the table.


That is not a good way to know!! you might not see it in the real world but that does not make the lens any better or less decentered, or less front or back focused.

Eventually under the right conditions you will see it in real world tests.. so why not test accurately right away and get it corrected if needed.

The one thing I agree is that you cannot be super picky. So if you are front focused by 1cm on MFD then don't stress over it.

Looking at your lens it does seem decentered. I had the same issue with my Sigma and I sent it for calibration. They told me that something was wrong with it since they could not reprogram and gave me a new one!
The new one is not decentered and super sharp!


Canon 70D | 15-85IS | Σ17-50/2.8 | Σ30/1.4 | 40/2.8 Pancake | 100/2.0 | 55-250STM | 430EXII

  
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mwsilver
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Feb 13, 2013 16:39 |  #12

Lexar wrote in post #15606883 (external link)
That is not a good way to know!! you might not see it in the real world but that does not make the lens any better or less decentered, or less front or back focused.

Eventually under the right conditions you will see it in real world tests.. so why not test accurately right away and get it corrected if needed.

The one thing I agree is that you cannot be super picky. So if you are front focused by 1cm on MFD then don't stress over it.

Looking at your lens it does seem decentered. I had the same issue with my Sigma and I sent it for calibration. They told me that something was wrong with it since they could not reprogram and gave me a new one!
The new one is not decentered and super sharp!

Now that i'm more familiar with the lens I ham having much better luck today. I am going to retest in a more controlled environment to ensure that i did it accurately. If the results are repeatable I'll consider my options.


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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Lexar
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Feb 13, 2013 19:52 |  #13

When testing make sure you use a tripod at 45 degree and use a remote trigger or timer. That way you know you are not moving it by accident. Take several pictures and compare.

At MFD and f1.4 the DOF is very narrow so your tests have to be precise!


Canon 70D | 15-85IS | Σ17-50/2.8 | Σ30/1.4 | 40/2.8 Pancake | 100/2.0 | 55-250STM | 430EXII

  
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NJKEV
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Feb 20, 2013 09:58 |  #14

I just picked up this lens and took some test shots around the house and found that it was out of focus. I did get sharper images when I manually focused but overall I'm not to happy with it.

Should I return it or send it to Sigma for them to correct it?




  
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05Xrunner
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Feb 20, 2013 10:55 |  #15

did you try and MA the lens at all?


My gear
Canon 7D Mark II, Canon 35 f2 IS, Sigma 50 1.4 EX, Canon 100mm f2, Tamron 70-200 2.8 G2, Sigma 150-600 C, Shanny SN600C flash, Tascam DR-05 v2
Fuji X-T1, Fuji X-T2, Fuji 18-55 2.8-4 OIS, Fuji 35 f2, Fuji 55-200 3.5-4.8 OIS
Sony RX100 II

  
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Sigma 30 mm f/1.4 Ex Dc HSM - Possible issues
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