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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Apr 2013 (Saturday) 23:06
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Is it Lenses or Camera? Please Help!

 
ducphunguyen
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Apr 13, 2013 23:06 |  #1

I've got my EOS 6D with kit lens EF 24-105mm F/4L.

Here are two pictures taken with the L:

http://www.flickr.com …8647612704/in/p​hotostream (external link)
at 24mm, F 4.0 , 1/180 s

http://www.flickr.com …8647613514/in/p​hotostream (external link)
at 88mm, F 4.0 , 1/80 s

Here are two pictures taken with brand new Sigma 35mm F/1.4

http://www.flickr.com …647614054/in/ph​otostream/ (external link)
at 35mm, F 1.4 , 1/100 s

http://www.flickr.com …646518335/in/ph​otostream/ (external link)
at 35mm, F 1.4 , 1/100 s

The vignetting is a lot. What do you think?


Please help - Thanks a lot!


Canon 7D || EF 40mm F/2.8 || EF 70-200mm F/2.8L IS II

  
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Sirrith
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Apr 13, 2013 23:12 |  #2

What exactly do you think the problem is?


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ducphunguyen
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Apr 13, 2013 23:13 as a reply to  @ Sirrith's post |  #3

Vignetting?


Canon 7D || EF 40mm F/2.8 || EF 70-200mm F/2.8L IS II

  
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maverick75
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Apr 13, 2013 23:15 |  #4

are you using filters/hoods?

Vignetting at 88 seems very odd.


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kin2son
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Apr 13, 2013 23:16 |  #5
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ducphunguyen wrote in post #15825254 (external link)
Vignetting?

Which is a one click fix in LR?


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DavidG.
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Apr 13, 2013 23:17 |  #6

I'm going to assume that you are referring to the darkening around the edges and especially the corners. This is called vignetting and is a not so uncommon thing. That is not to say it is a fault of the camera, but one of the lens. What happens is that the lens is not capable of bending light into the far edge of the image circle produced by the lens as it can to the center. The farther out from the center of the picture, the darker the picture will be exposed. It happens with 100 dollar lenses, and it happens with multi thousand dollar lenses.


Take a look at this link.

http://www.the-digital-picture.com …355&Camera=9&Le​nsComp=829 (external link)


Canon 5D Mark III | Canon 7D | 17-40 f/4L | 24-70 2.8 L | 70-200 f/4 L | 70-200 f/2.8 L IS | 580 EX II

  
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samsen
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Apr 13, 2013 23:17 |  #7

Are you referring to vignette or focusing issue?


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samsen
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Apr 13, 2013 23:19 |  #8

Well I thought its only me that is confused with your issue.

Please explain more as to what is that bothers you.


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ducphunguyen
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Apr 13, 2013 23:23 as a reply to  @ maverick75's post |  #9

No, I did not use filter or hood (actually, I could not even mount the hood - too loose)


Canon 7D || EF 40mm F/2.8 || EF 70-200mm F/2.8L IS II

  
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ducphunguyen
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Apr 13, 2013 23:25 |  #10

samsen wrote in post #15825268 (external link)
Well I thought its only me that is confused with your issue.

Please explain more as to what is that bothers you.

What bother me is the four corner of the images is too dark, even at 88mm.
I don't know if I should return/exchange another lens.


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bespoke
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Apr 13, 2013 23:26 |  #11

its just part of the full frame goodness people talk about


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DavidG.
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Apr 13, 2013 23:34 |  #12

bespoke wrote in post #15825292 (external link)
its just part of the full frame goodness people talk about

Yes, don't think of it as a negative, it's artsy!:cool:


Canon 5D Mark III | Canon 7D | 17-40 f/4L | 24-70 2.8 L | 70-200 f/4 L | 70-200 f/2.8 L IS | 580 EX II

  
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bespoke
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Apr 13, 2013 23:37 |  #13

my zeiss 35 vignettes heavier than that and it's an f/2!


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darosk
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Apr 13, 2013 23:53 |  #14

Vignetting is so hot.


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aduda
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Apr 14, 2013 00:20 as a reply to  @ darosk's post |  #15

The results you post are suprising to me too. I would not have expected to see the amout of vignetting at 85mm that you show there.

But, I think that what you are seeing is more a product of the type of light you are shooting in, rather than the lenses you are shooting with.

I do not do any type of scientific gear testing, so I can not say for sure....but my guess is, if you were to do these same tests in daylight instead of flourecent light, you would have very different outcomes.

Now, that is not to say that the test you performed is not valuable. If that is the environment that you usually shoot in, then it is a great test.

So...I could be wrong, and I am sure more technical people here will correct me if I am....but I feel like the vignetting you see may be accentuated by the environment you are shooting in.


6D, 5D, 20-35 2.8L, 135L, 70-200 2.8IS L, Sigma 50 1.4, Sigma 105 2.8 macro, SMC Takumar 28 3.5, SMC Takumar 50 1.4, Super-Takumar 105 2.8

  
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