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Thread started 29 May 2014 (Thursday) 23:58
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Problems with SIgma 50mm 1.4 ART

 
pinoyplaya
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Jun 26, 2014 22:23 |  #46

snake0ape wrote in post #16996824 (external link)
Those numbers doent seem logical. What happens at .55m? Try at 10m too? Just focus on a letters taped on wall.

The dock only allows you to set adjustments at those 4 distances.

I wonder if the calibration creates some sort of a regression line so that in between the distances it uses the adjustment based on the equation derived from the 4 point adjustments that were made.


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snake0ape
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Jun 26, 2014 22:28 |  #47

pinoyplaya wrote in post #16996846 (external link)
The dock only allows you to set adjustments at those 4 distances.

I wonder if the calibration creates some sort of a regression line so that in between the distances it uses the adjustment based on the equation derived from the 4 point adjustments that were made.

What I meant is with your lens calibrated with your numbers, go out and shoot something. Shoot at distances in between your calibration point distances to see if what you shoot is sharp.

FYI, My calibration numbers are 0,0,+1,0. Mine is sharp as a tack at all distances.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Thestructured
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Jul 24, 2014 16:32 as a reply to  @ post 16941561 |  #48

I'm posting an update.

I've not been through four copies of the sigma 50 art. All of them have focus problems.

#1, #3, and #4 have the outer point front focusing problem. Center point is fine, most of the time, though they do randomly miss occasionally, but whatever.

#2 seemed to not have this issue, but I returned it because I found a better price elsewhere (it was bought at an inflated price due to supply and demand). It also, may have had the issue, and I just didn't notice or was in denial because I didn't want to return another one over that.

I did use that one at a wedding, and after going through the photos I noticed that the in focus percentage was extremely low, say, 30-40%. ESPECIALLY with servo focusing.

So, here I am, I have two copies sitting at my house waiting to be returned to the dealers who sold them to me. I feel horrible for making so many returns, and I'm getting tired of playing this game. But they just plain, do not work right. Tested on three camera bodies that have no issues with other lenses.


SIgma service has acknowledged that this issue has been reported by some people, but that there is no way to fix it yet. They are waiting for the company to release new firmware and software that will allow them to fix this.

I have also read in other forums of many other people having this exact same issue, so I know I'm not crazy, and it feels better that I'm not alone. This lens is such a tease. Incredible optics that you can't make use of because you can't trust it to focus properly.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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snake0ape
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Jul 24, 2014 18:57 as a reply to  @ Thestructured's post |  #49

Sorry that you are having little luck with this lens. I'm using firmware 1.2.3 on 5diii and I have no focus issues with mine. What I have notice is that when I use this lens, I do not double pump the AF when I shoot. It seems if I click once my success rate is better. It's on par with my canon lens and about 90% for stills. Regarding servo mode, I don't use as much for action shots because I feel I have more control without using it, especially when I want to aim for the eyes.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Thestructured
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Jul 24, 2014 20:06 as a reply to  @ snake0ape's post |  #50

I don't know what to do next. A 5th copy?

At some point the dealers are going to say no. I feel awful for them, because this is not their fault.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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snake0ape
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Jul 24, 2014 20:16 |  #51

Thestructured wrote in post #17054221 (external link)
I don't know what to do next. A 5th copy?

At some point the dealers are going to say no. I feel awful for them, because this is not their fault.

Try local. You can shoot in the store till you find one that is good. I think the lens is about to meet demand.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Dlee13
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Jul 24, 2014 20:27 |  #52

Thestructured wrote in post #17054221 (external link)
I don't know what to do next. A 5th copy?

At some point the dealers are going to say no. I feel awful for them, because this is not their fault.

If I was you I would return both copies and wait for confirmation from Sigma that the issue is solved, no point in wasting your time/money continuously buying copies when the issue isn't solved!


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AlanU
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Jul 24, 2014 21:15 |  #53

OP,

are you experiencing any focus issues with your 6d?


5Dmkiv |5Dmkiii | 24LmkII | 85 mkII L | | 16-35L mkII | 24-70 f/2.8L mkii| 70-200 f/2.8 ISL mkII| 600EX-RT x2 | 580 EX II x2 | Einstein's
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Sony 2 x A7iii w/ Sigma MC-11 adapter | GM16-35 f/2.8 | Tamron 28-75 f/2.8 | GM70-200 f/2.8 |Sigma Art 24 f/1.4 | Sigma ART 35 f/1.2 | FE85 f/1.8 | Sigma ART 105 f/1.4 | Godox V860iiS & V1S

  
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Thestructured
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Jul 24, 2014 23:21 |  #54

AlanU wrote in post #17054356 (external link)
OP,

are you experiencing any focus issues with your 6d?

Yes.

on the 6d the center focus point works, so do the ones on the top and bottom, and the ones to the immediate left and right of center. The four diagonal to the center do not, and the far left and right are WAY off.

on the 5d3 the entire center cluster works, but none of left or right side clusters.

Others have noted this issue.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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AlanU
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Jul 25, 2014 00:05 |  #55

Thestructured wrote in post #17054564 (external link)
Yes.

on the 6d the center focus point works, so do the ones on the top and bottom, and the ones to the immediate left and right of center. The four diagonal to the center do not, and the far left and right are WAY off.

on the 5d3 the entire center cluster works, but none of left or right side clusters.

Others have noted this issue.

Just when I actually considered a sigma 50A......

Is there mass amounts of Sigma owners complaining about the 35 ART?? with the same issues as the 50A???

I lost faith in Sigma after I spent a portion of my life trying to find a Sigmadud earlier versions of the 50mm. I really was hoping something miraculous happened in the ART series.


5Dmkiv |5Dmkiii | 24LmkII | 85 mkII L | | 16-35L mkII | 24-70 f/2.8L mkii| 70-200 f/2.8 ISL mkII| 600EX-RT x2 | 580 EX II x2 | Einstein's
Fuji - gone
Sony 2 x A7iii w/ Sigma MC-11 adapter | GM16-35 f/2.8 | Tamron 28-75 f/2.8 | GM70-200 f/2.8 |Sigma Art 24 f/1.4 | Sigma ART 35 f/1.2 | FE85 f/1.8 | Sigma ART 105 f/1.4 | Godox V860iiS & V1S

  
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Thestructured
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Jul 25, 2014 01:25 |  #56

AlanU wrote in post #17054651 (external link)
Just when I actually considered a sigma 50A......

Is there mass amounts of Sigma owners complaining about the 35 ART?? with the same issues as the 50A???

I lost faith in Sigma after I spent a portion of my life trying to find a Sigmadud earlier versions of the 50mm. I really was hoping something miraculous happened in the ART series.

There are plenty of people that claim they are not having this phenomenon and everything works fine. Then there are people that needed to tweak focus at various distances via sigma dock. Then there are people like me having the off center focus point problem.

Four in a row though, is more than just bad luck.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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mystik610
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Jul 25, 2014 06:12 |  #57

AlanU wrote in post #17054651 (external link)
Just when I actually considered a sigma 50A......

Is there mass amounts of Sigma owners complaining about the 35 ART?? with the same issues as the 50A???

I lost faith in Sigma after I spent a portion of my life trying to find a Sigmadud earlier versions of the 50mm. I really was hoping something miraculous happened in the ART series.

Can't speak for anyone else, or the expectations of anyone else, but no focus issues with my Sigma 50A or Sigma 35A. That said, I haven't done too much real AF testing other than focal focus consistency tests (in which both of my Sigma lenses performed similarly to my other Canon primes), but I haven't had any significant issues in real world shooting to warrant it. I will say that shooting with large apertures and phase detect AF has its inherent quirks regardless if you're using a Sigma or Canon lens. Phase detect AF is a less than perfect system, and you should expect to miss shots occasionally when dealing with such a narrow focal plane. Really, manual focus is the most consistent way to nail a shot wide open with a fast prime. This is the case with my Sigma 50A and 35A, but also an issue for my 85L too. My old 50L was a downright problem child.


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Thestructured
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Jul 25, 2014 12:06 |  #58

mystik610 wrote in post #17054908 (external link)
Can't speak for anyone else, or the expectations of anyone else, but no focus issues with my Sigma 50A or Sigma 35A. That said, I haven't done too much real AF testing other than focal focus consistency tests (in which both of my Sigma lenses performed similarly to my other Canon primes), but I haven't had any significant issues in real world shooting to warrant it. I will say that shooting with large apertures and phase detect AF has its inherent quirks regardless if you're using a Sigma or Canon lens. Phase detect AF is a less than perfect system, and you should expect to miss shots occasionally when dealing with such a narrow focal plane. Really, manual focus is the most consistent way to nail a shot wide open with a fast prime. This is the case with my Sigma 50A and 35A, but also an issue for my 85L too. My old 50L was a downright problem child.

I agree but the problem isn't an occasional miss, it's a consistent front focus shift with outer points.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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PrinceAbubu
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Jul 27, 2014 21:44 |  #59

I have the same problem on my 6D and canon 50mm 1.4 combo. If i use the outer focus it finds it find but when looking through the image you can see the object to the right is sharper than the object which was suppose to be in focus by the outer focus point.

Annoying. i stayed up all night tring to find the correct adjustment. I can't seem to get consistent adjustment using the 2 1/2 metres distance from the subject. So i went with a 1 metre distance approach and got more consistent with adjusting the centre focus point (+10).

I'll have to do some test runs when i get home. which kinda sucks coz i get home pretty late and have to rely on lightbulbs!


Canon 6D | 17-40 F4 L | 70-200 F2.8 L | 50 1.4 | | 430EX II Flash | Olympus OM-D E-M10 14-42mm kit lens | Sony A5000 with 16-50mm kit | Velbon Sherpa 600R | Manfrotto Monopod 790B | Naneu Pro urbangear U30 |Lowe Pro Flipside 200 | Toploader pro 75AW | wish list Fujifilm XT1 with 35mm f2 | (goneski) 1DsMk1, 450D with 18-200mm, 40mm stm

  
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Thestructured
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Aug 03, 2014 18:51 as a reply to  @ PrinceAbubu's post |  #60

it seems that a lot of 50mm lenses are plagued with this. It's really weird.

My canon 50mm 1.4 that I used to have also had that problem, but my friend's new canon 50mm 1.4 is absolutely flawless at all points.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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Problems with SIgma 50mm 1.4 ART
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