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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Sep 2010 (Saturday) 18:50
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Vignetting with Canon 24-105mm?

 
Soto
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Sep 18, 2010 18:50 |  #1

Hello,

I'm using the Canon 24-105mm F/4 lens in my 5DMKII and I'm seeing that sometimes I get a vignetting effect in the photos.

Is this normal?

Here is an example... this photo is not edited.. as it came from the camera

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Tim ­ Kostka
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Sep 18, 2010 19:10 |  #2

At 24mm, yes.


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JonSC
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Sep 18, 2010 19:16 |  #3

When it is 24mm at f/4 vignetting is inevitable, especially on a FF.



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Soto
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Sep 18, 2010 19:22 |  #4

Would that happen only at F/4?... @24mm




  
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Tim ­ Kostka
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Sep 18, 2010 19:56 |  #5

Soto wrote in post #10933972 (external link)
Would that happen only at F/4?... @24mm

It's most apparent at those settings, and decreases as you zoom out or stop down. It's not really an on/off thing, there's some amount of vignetting at all settings. But it's easily corrected in most image processors.


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JeffreyG
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Sep 18, 2010 20:11 |  #6

The 24-105 vignettes a lot below 28mm. Stopping down helps, but you can see it even stopped down.

It also has some pretty heavy distortion in that range. Take it to the beach some time and check it out.


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FlyingPhotog
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Sep 18, 2010 20:15 |  #7

It's actually more a case of "Light Falloff" than anything else. The corners do not transmit light as well as the middle of the lens.


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JeffreyG
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Sep 18, 2010 20:27 |  #8

FlyingPhotog wrote in post #10934161 (external link)
It's actually more a case of "Light Falloff" than anything else. The corners do not transmit light as well as the middle of the lens.

It's not so much that the car crashed as it is that the car ran into a wall.:D

Notice how those are the same thing?

What is the difference between vignetting and light fall off?;)


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lannes
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Sep 18, 2010 22:03 |  #9

If your shooting JPEGS, we assume you have "Peripheral Illumination Correction" set for the 24-105mm.
You can also apply PIC to images in DDP while post processing.


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Soto
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Sep 18, 2010 23:17 |  #10

lannes wrote in post #10934669 (external link)
If your shooting JPEGS, we assume you have "Peripheral Illumination Correction" set for the 24-105mm.
You can also apply PIC to images in DDP while post processing.

No, I don't have that set... I usually shot in raw. Anyway, that would be something to look at if I shot in JPEG. Thanks!!!




  
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FlyingPhotog
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Sep 18, 2010 23:20 |  #11

JeffreyG wrote in post #10934219 (external link)
It's not so much that the car crashed as it is that the car ran into a wall.:D

Notice how those are the same thing?

What is the difference between vignetting and light fall off?;)

Vignette (to me) is a physical blockage of light that can happen with any lens due to using the wrong hood, mis-mounting a hood or putting something in front of the lens.

Light Falloff is a design property that manifests itself in lesser lenses.

My 100-400 exhibits light falloff wide open @ f/5.6 but my 300 f/2.8 and 500 f/4 don't exhibit this tendency anywhere near as badly.

The 24-105 shows light falloff much more so than does the "Brick."


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czeglin
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Sep 18, 2010 23:40 |  #12

FlyingPhotog wrote in post #10934948 (external link)
Vignette (to me) is a physical blockage of light that can happen with any lens due to using the wrong hood, mis-mounting a hood or putting something in front of the lens.

Light Falloff is a design property that manifests itself in lesser lenses.
The 24-105 shows light falloff much more so than does the "Brick."

I'm gonna go ahead and call them both vignetting (external link). Arguably one is "optical" and one is "mechanical". That's usually pretty clear from the context: "How is vignetting wide open on the 24L?" vs. "Does the 16-35L require a slim CPL to avoid vignetting?"

Also, I don't think it's fair to call it a lesser lens because it vignettes. Looking at some test shots the 24-70 is far worse at f/2.8 than the 24-105 at f/4, and slightly better when stopped down to f/4. The 85L will have CA wide open. Is it a lesser lens? The 24L and 35L with vignette massively when wide open. Are they lesser lenses?


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JeffreyG
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Sep 19, 2010 06:19 |  #13

FlyingPhotog wrote in post #10934948 (external link)
Vignette (to me) is a physical blockage of light that can happen with any lens due to using the wrong hood, mis-mounting a hood or putting something in front of the lens.

Light Falloff is a design property that manifests itself in lesser lenses.

Definition.
In photography and optics, vignetting  is a reduction of an image's brightness or saturation at the periphery compared to the image center.

If your hood is not installed correctly and you have black corners in the image, the condition is best described as 'partially occluded'.

Most definitions for 'vignette' list 'light fall off' as being the same thing. Both involve gradation of light from center to edge which is a function of the lens design.


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NinetyEight
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Sep 19, 2010 06:56 |  #14

Soto - I assume you don't have any filters fitted to the front of the lens? This could cause vignetting (or light fall-off :p) to be more pronounced.

I notice a small amount on my EOS 3 film body but on my 50D (crop) it's hardly noticeable.


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MichSt
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Sep 19, 2010 07:15 |  #15

Soto wrote in post #10933835 (external link)
Hello,

I'm using the Canon 24-105mm F/4 lens in my 5DMKII and I'm seeing that sometimes I get a vignetting effect in the photos.

Is this normal?

Here is an example... this photo is not edited.. as it came from the camera

Yes, vignetting is very pronounced on the 24-105 from 24 to 35 or so. Even stopped down it's going to be noticeable. Software can correct for this, but when you have +1 stops of vignetting there's only so much correcting you can do in PP before you start getting grainy, mushy corners.


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