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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Apr 2009 (Friday) 07:50
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Soft Sigma 50mm 1.4 HSM

 
phigment
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Apr 24, 2009 07:50 |  #1

Hi, I already posted something similar in the Sigma 50mm image samples thread, but I didn't want too spam that thread with more images that may be off topic.

Other post: https://photography-on-the.net …p?p=7792371&pos​tcount=956

I took more pictures at various apetures. It seems that my lens doesn't sharpen up until about f/5.6 or f/8. Are the following images typical of this lens?

I used a tripod, 2 second shutter timer and mirror lockup. RAW, DPP processed with no sharpening. The bottle is on an angle to show that focus is on the 'C'.

Thanks for any help and replies.

f/1.4


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f/2.0

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phigment
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Apr 24, 2009 07:52 |  #2

f/2.8


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f/4.0

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phigment
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Apr 24, 2009 07:52 as a reply to  @ phigment's post |  #3

f/5.6


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f/8.0

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yashart
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Apr 24, 2009 07:56 as a reply to  @ phigment's post |  #4

They do look a bit soft, but a 2 second shutter seems a bit long...what was your ISO set it in these photos? Try shooting outside or in an area with much better lighting, and post up samples.


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bacchanal
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Apr 24, 2009 08:16 |  #5

yashart wrote in post #7794598 (external link)
They do look a bit soft, but a 2 second shutter seems a bit long...what was your ISO set it in these photos? Try shooting outside or in an area with much better lighting, and post up samples.

The shutter speeds were between 1/250 and 1/8. He used a 2 second timer on the shutter to avoid vibrations.

OP, have you tried using micro adjust? It looks like the lens could possibly be front focusing. Definitely looks soft though. Are these 100% crops or full frames?


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phigment
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Apr 24, 2009 08:20 |  #6

yashart wrote in post #7794598 (external link)
They do look a bit soft, but a 2 second shutter seems a bit long...what was your ISO set it in these photos? Try shooting outside or in an area with much better lighting, and post up samples.

ISO was 400. And like bacchanal said, it was on a tripod with 2 second timer and mirror lockup to avoid vibrations and camera shake.

I will try some shots in better light later on today.


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AngryCorgi
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Apr 24, 2009 08:45 |  #7

Front focusing would not cause this softness. There is a clear "in-focus" area on each shot and micro-adjust will not fix this issue. I just can't believe your copy is not any sharper than it is at f/2 and f/2.8. I get a huge jump in contrast from f/1.4 to f/2.

Try using a better target too. The print on bottles is often soft and murky anyway. Try a printed black-on-white document for testing.


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weezerfan84
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Apr 24, 2009 08:52 |  #8

Try better light and see how well the lens performs. At f/8 the C of Cuervo is sharp, but the J in Jose seems soft. I would definitely expect it to be sharper at that aperture. Mine is pretty dang sharp at f/4.


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Mr. ­ Clean
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Apr 24, 2009 08:58 |  #9

It just needs to go back. It's not the settings on this one, it's the lens.


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weezerfan84
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Apr 24, 2009 09:04 |  #10

Good call Mr. Clean and Angry Corgi.


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ThomasOwenM
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Apr 24, 2009 09:06 as a reply to  @ Mr. Clean's post |  #11

I'm having the same problem with mine, and I also have the Canon 50 mm f/1.4 to compare it to. I'm probably sending mine back to Sigma for callibration. I've read other posts and reviews from other photographers who own this lens. Many of them said the lens was spot on after callibration.

Here's my post with my sample shots, with comparisons to the Canon version of the lens:

https://photography-on-the.net/forum/showthre​ad.php?t=683065


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[Hyuni]
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Apr 24, 2009 09:10 |  #12

Op is taking a picture of a curved subject.
hard to tell if it's just soft or DoF is playing a factor.

My standards must be low, because if those are 100% crops, I don't see anything wrong with the softness at 1.4 and it starts to get sharp after that.


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thatkatmat
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Apr 24, 2009 09:11 |  #13

ThomasOwenM wrote in post #7795033 (external link)
I'm having the same problem with mine, and I also have the Canon 50 mm f/1.4 to compare it to. I'm probably sending mine back to Sigma for callibration. I've read other posts and reviews from other photographers who own this lens. Many of them said the lens was spot on after callibration.

Mine was, but it wasn't near as soft as the shots above BEFORE I sent it in.


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bacchanal
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Apr 24, 2009 09:13 |  #14

AngryCorgi wrote in post #7794898 (external link)
Front focusing would not cause this softness. There is a clear "in-focus" area on each shot and micro-adjust will not fix this issue. I just can't believe your copy is not any sharper than it is at f/2 and f/2.8. I get a huge jump in contrast from f/1.4 to f/2.

Try using a better target too. The print on bottles is often soft and murky anyway. Try a printed black-on-white document for testing.

How can you be so sure it's not front focusing as the bottle is round and there is nothing in front of the target (the "C"). It's possible that we're just seeing the tail end of the dof range. Anyway, I suppose this could be easily verified with live view + MF.

The halation in the f/1.4 shot sure makes it look like there is something wrong with the lens though.


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phigment
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Apr 24, 2009 09:38 |  #15

bacchanal wrote in post #7795104 (external link)
How can you be so sure it's not front focusing as the bottle is round and there is nothing in front of the target (the "C"). It's possible that we're just seeing the tail end of the dof range. Anyway, I suppose this could be easily verified with live view + MF.

The halation in the f/1.4 shot sure makes it look like there is something wrong with the lens though.

Hi Everybody. Thanks for the quick responses.
A quick note: These were manual focused using LV at 10X mag. And the bottle is square. Here are two shots of the entire image for reference:

f/1.4


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f/8

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Soft Sigma 50mm 1.4 HSM
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