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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 May 2014 (Thursday) 23:58
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Problems with SIgma 50mm 1.4 ART

 
Thestructured
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May 29, 2014 23:58 |  #1

I want to love this lens so much because the optics are amazing. The colors are rich and the contrast is great...so is the flare control and the sharpness. But The focus inconsistency is driving me insane. Using center focus points on my 5d mark 3 it seems to be focusing well most of the time. Using outer cross type points, it's front focusing intensely. Focusing with the center point and recomposing yields an in focus photo while using an outer point falling on the focus area does not.

I have experienced this type of issue so many times, with nearly every canon camera I've ever owned, however I haven't noticed this with my 5d mark iii until I mounted this lens. I have no idea whether it's the lens or camera, but I don't recall having this issue with other lenses (except other 50mm lenses....). It's not user error, I've tested it on a tripod, and I shoot my 85L at f1.2 hand held all the time with no issues. I have no idea whether to send the camera in for calibration or the lens.


Frustration. Why can't things just work.


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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sportmode
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May 30, 2014 00:25 |  #2

Why not return it and get a new one?


5D Mark III, 6D, EOS-M 22mm f/2 | 24-70mm f/2.8L II | 50mm f1.4 | 100L | 70-200mm f/2.8L IS II | Rokinon 8mm Fisheye

  
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Thestructured
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May 30, 2014 00:33 |  #3

Because they are on pre-order, they are not in stock anywhere. Also, there is a large dust spec already inside the front element. I've had the lens for ONE DAY.

Maybe I will try to exchange it.


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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May 30, 2014 00:37 |  #4

Have you micro focus adjusted your lens? Mine needed a +5 adjustment.


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Thestructured
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May 30, 2014 00:41 |  #5

Adding +4 MA tweaked the center point focusing to perfection, but does nothing to fix the outer points. If I MA +20, then the focus is almost right when using outer focus points, but screws up focus with the center points.

I don't know what the deal is. I will have to test it on my other camera when I get back to my house (I'm out of town). Nothing more frustrating than putting hundreds of actuations on your cameras trying to figure out an 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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DreDaze
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May 30, 2014 00:54 |  #6

if focus recompose yields a in sharp photo...i'd think that would mean it's front focusing


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Thestructured
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May 30, 2014 01:02 |  #7

The center point, NOT recomposed (focusing on something in the center of the frame) results in a sharp photo. Focusing on something with an outer point, on the side of the frame, results in an out of focus photo. Turning the camera (tripod mounted) to focus on that same spot using the center focus point instead of using an outer point and turning it back to the original position, results in a photo perfectly focused where the outer point lies. Baffled.


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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Thestructured
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May 30, 2014 01:03 |  #8

The full frame:

IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-05-30%2001.46.17.png

focused via center point and recomposed (on tripod):
IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-05-30%2001.46.25.png

Focused using outer point:
IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-05-30%2001.46.29.png

Same results in handheld tests, and I've tested multiple outer points on both sides.

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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rick_reno
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May 30, 2014 01:07 |  #9

Given my experience with one of their 50 f/1.4 lenses, you have demonstrated why I never bought another.




  
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Thestructured
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May 30, 2014 01:08 |  #10

Focused straight on with a center point with no recomposition:

IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-05-30%2002.07.09.png
IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-05-30%2002.07.04.png

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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Thestructured
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May 30, 2014 01:09 |  #11

rick_reno wrote in post #16939614 (external link)
Given my experience with one of their 50 f/1.4 lenses, you have demonstrated why I never bought another.

yeahh.....haha


I don't have these issues with the 35mm art though.


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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Thestructured
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May 30, 2014 01:36 |  #12

This article seems to hint that It may be a 5d iii issue, as a few people experience this exact problem with the 5d iii and 50L. http://www.dpreview.co​m/forums/thread/349626​4?page=1 (external link)


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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FEChariot
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May 30, 2014 02:04 as a reply to  @ Thestructured's post |  #13

Looks like you need to shoot in servo all the time I guess. Bryan from TDP called out AF inconsistencies in one shot too:

http://www.the-digital-picture.com …-1.4-DG-HSM-Art-Lens.aspx (external link)

I'm holding on to my Canon 50/1.4 at least until Canon releases a new 50/1.4 IS or 50/1.8 IS or what ever they come up with.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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youngr
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May 30, 2014 04:22 |  #14

Is sending it to Sigma not an option?




  
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Nick3434
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May 30, 2014 05:08 |  #15

Sucks. Mine is cool throughout on a 6D, maybe the thread you found is the answer.

I don't know how AF works, but I would assume the camera tells the lens to move, and if it tells it in the same language as a point that works, then wouldn't the camera be the likely culprit? I would be testing all my lenses to confirm the results, then go from there.


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Problems with SIgma 50mm 1.4 ART
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