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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 02 May 2009 (Saturday) 14:23
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Another Sigma 10-20 Sharpness Question

 
wr1020
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May 02, 2009 14:23 |  #1

So i made a new post regarding my Sigma 10-20 about a month ago asking about its sharpness. Others said my copy was fine but i still had doubts. So i went to the Dodger game a couple days ago and took the lens with me and this photo was taken from my seat. Is edge sharpness that off on UWA lenses because all four corners are pretty blurry. Field looks pretty sharp since it is the center of the frame but i just wanna make sure the lens is fine, if not i'm gonna send it into Sigma. 1/25 second shutter speed shot at f/7.1. Haven't edited any of these yet so all shots are straight from camera. Thanks

IMAGE: http://i40.tinypic.com/5k0fhv.jpg

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KenjiS
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May 02, 2009 14:25 |  #2

That spot on the left looks..off to me..id send it in


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DreDaze
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May 02, 2009 14:37 |  #3

where'd you focus?...any other shots that show the softness?

also you're kinda bordering on the edge of hand shake coming into play...you shot it at 13mm...so with crop factor...the rule of thumb would be 1/20...

before sending it in i'd set it on a tripod for a more thorough test


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handyhaver
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May 02, 2009 14:45 as a reply to  @ DreDaze's post |  #4

I got no complaints with mine. Pic just cropped & resized. Love this lens..

https://photography-on-the.net …362019&stc=1&d=​1241282272


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Brett
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May 02, 2009 14:52 |  #5

Assuming that the field is probably 200-300 feet from the camera, the hyperfocal distance is about 4 feet. Everything should be in sharp focus from there to infinity.

But as Dre says, you're flirting with camera shake at that shutter speed.

I have one from when I had my XSi (haven't gotten around to selling it yet), and it was pretty darn sharp. Test it some more, with shutter speeds that rule out camera shake, and if you're still getting results like this, send it in.

It's not rare at all for that lens to have to go back to Sigma, if not several times.



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wr1020
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May 02, 2009 15:06 |  #6

So heres some other random shots i grabbed off my memory card. I know it's not the best way to test the lens but its what i had in the card right now so i figured i'll just post these, don't have time to go out right now and test the lens out. One is my nephew and the other is a picnic bench in my backyard. Also thanks for the quick replies and comments.

IMAGE: http://i44.tinypic.com/1zbvxjb.jpg
IMAGE: http://i43.tinypic.com/2zghgcw.jpg

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DreDaze
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May 02, 2009 16:59 |  #7

wr1020 wrote in post #7845202 (external link)
So heres some other random shots i grabbed off my memory card. I know it's not the best way to test the lens but its what i had in the card right now so i figured i'll just post these, don't have time to go out right now and test the lens out. One is my nephew and the other is a picnic bench in my backyard. Also thanks for the quick replies and comments.
QUOTED IMAGE
QUOTED IMAGE


i don't know why the pics aren't popping up now...they were earlier...we kinda need to know what you focused on in the shots...if you focused on your nephews shirt in the first one...even shot at f/11 @10mm if you were only 12 inches away the DOF is still only ~2 feet or so...


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wr1020
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May 02, 2009 17:04 |  #8

DreDaze wrote in post #7845631 (external link)
i don't know why the pics aren't popping up now...they were earlier...we kinda need to know what you focused on in the shots...if you focused on your nephews shirt in the first one...even shot at f/11 @10mm if you were only 12 inches away the DOF is still only ~2 feet or so...

On the bench picture i focused on the beam of wood going across and of my nephew i focused on his face.


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DreDaze
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May 02, 2009 17:25 |  #9

wr1020 wrote in post #7845649 (external link)
On the bench picture i focused on the beam of wood going across and of my nephew i focused on his face.


based on some guesses as to how far you were from where you focused...and then plugged into here: http://www.dofmaster.c​om/dofjs.html (external link) i don't know if you could expect the whole image to be in focus...i think your 2 shots that you added after look o.k....and i think the stadium shot suffered from camera shake....if you're really worried though i think the best thing to do is put it on a tripod and test it


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Raymate
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May 02, 2009 18:05 |  #10

Looks a tad off to me, I had the same issue with mine, nothing was that sharp and towards the edges it was very bad.

Sent it back for calibrating (mine was front focusing) and that did the trick I get sharp pics all the time.

If you feel it's not right then it may not be, send it in for calibration.


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DutchOven
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May 06, 2009 10:56 |  #11

how much does it cost to send it in for calibration?


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Raymate
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May 06, 2009 19:58 |  #12

DutchOven wrote in post #7868361 (external link)
how much does it cost to send it in for calibration?

If under warranty it should be free, you may need to pay postage, call them and check before you send.


Canon: EOS 5DmkII • 50D • 40D • 350D • 100 f2.8L IS Macro • 70-200 f4L • 24-105 f4L IS • 17-40 f4L • 50 f1.4 • 60 f2.8 Macro • 85 f1.8 • 430EX • 580EX II • ST-E2
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dnas
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May 06, 2009 20:59 |  #13

First of all, I'd get two perfectly flat pages of text, a tripod and a flat field (a wall) in bright light, and stick one at the center, and one on the corner (or have 5 sheets, with one in each corner, one in the middle) and take a controlled shot, wide open, then stopped down.
You need this controlled situation to see if there is really a problem




  
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Another Sigma 10-20 Sharpness Question
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