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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 10 May 2012 (Thursday) 18:45
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Sigma 50 1.4

 
TjMartin
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Location: NH
     
May 10, 2012 18:45 |  #1

This is my third copy from B&h, I was very hopeful this one would be sharp, but it's all fuzzy at 1.4.
I took some photos of my girlfriend as well, head shot, focusing dead on her eye ball and it comes out all blurry.

I need some advice, I'm not trying to make sigma look bad because I want this lens to work in a big way, I don't want to have to go with the canon 50 1.4, or get my Sigma 17-50 after just selling it go get the sig 50.

Do you think sending it to Sigma would fix this, and is it worth it?

Focusing on his left eye.
1.4

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

2.5
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO


Focusing on the H.
1.4
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

2.8
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

60D + sigma 17-50 2.8 + canon 50 1.8 + a big wish list on my BH account:)
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John ­ from ­ PA
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May 10, 2012 19:02 |  #2

You may very well be pushing the limits of the lens. Your profile indicates you have a 60D so I ran some depth of field numbers based on that body and at subject distances of 15 and 20 inches. See the summary below. As you can see at f/1.5 and 15 inches to the subject, the depth of field is roughly 1/8 inch so not much would be in focus on the flower pot. On the keyboard, keep in mind that the camera body uses differing contrast to establish focus. Focusing on the "H" key might seem to provide contrast but likely doesn;t work as well as a solid white object next to a solid black object and the boundary within the center focus point, which I assume you are using. Also, when judging something like a keyboard, maybe at 20 inches to the "H" key, then as you move across the keyboard the distance becomes greater. In other words if perfect focus was obtained on the "H" at a subject distance of 15 inches (f/1.4) where the depth of field is 0.11 inch, then the letter "A" is likely 15-1/2 inches from the camera and out of focus because it is outside the defined circle of confusion used for the DOF calculation. You can play with the numbers at http://www.dofmaster.c​om/dofjs.htm (external link).

60D with 50mm f/1.4 at subject distance of 15 inches total DOF 0.11 inches

60D with 50mm f/1.4 at subject distance of 20 inches total DOF 0.20 inches

60D with 50mm f/2.5 at subject distance of 15 inches total DOF 0.19 inches

60D with 50mm f/2.5 at subject distance of 20 inches total DOF 0.35 inches




  
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L.J.G.
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May 10, 2012 19:17 |  #3

I am just in the process of dealing with my supplier to swap over my first copy. Distance measurements for DOF at various settings aside, mine can be fine one shot, I mean really good, then crap for the next half a dozen or more. If it was a DOF distance problem it would be out every time. I was at a model shoot the other day and having issues, so switched over to my 85 f1.4 and it was tack sharp and spot on every shot. Tried the 50 again, same deal, so far out of focus most times it just wasn't funny, it did not seem to focus on anything in particular at all. If it focused as well as my old Canon F1.4 I would be a happy man because it is exceptional when it is right.


Lloyd
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kin2son
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May 10, 2012 19:19 |  #4
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Why ISO400 on the first pic? You have 1/8000 shutter speed.....lower the ISO to 100...

Test it on tripod. Honestly they look fine to me @ f1.4...you can't expect decent sharpness wide open. That's just the nature of any lens really...


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erusty
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Location: east coast
     
May 10, 2012 19:23 |  #5

I sent the one I bought here for calibration, I hope it comes out fine :/ I think your copy looks fine to me , I had it worse off. It was front focusing by about 1 inch




  
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rick_reno
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May 10, 2012 19:49 |  #6

this could be a conspiracy amongst camera gear vendors, they cycle returned stock between one another. i got 3 bad ones from Amazon too, maybe you got the same ones i had. I gave up.




  
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Jason ­ B.
Senior Member
344 posts
Joined Jan 2008
Location: Northwest Arkansas
     
May 10, 2012 20:16 as a reply to  @ rick_reno's post |  #7

I tried 2 copies and ended up sending my last to Cris Camera.Total turnaround was 8 days and it was spot on after that. It really is worth sending in and getting calibrated. Its a nice lens.


5DMarkII|24-105 F4L|70-200 2.8L IS II|580EXII|

  
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Sigma 50 1.4
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