Why Vignetting

[DannyLewis]

I have darkness in the corners and the outer edges of this picture the len's is a new canon 100 400mm IS USM so it should be good all throughout the picture. WHat would cause this. It is only in the open air pictures not other's.View attachment 21309

 

[ceejtank]

Do you have a lens hood on this? And is it the correct lens hood for that lens?

I had a lens hood that came with a lens I bought of amazon, and I used it, I forget which lens it was on, but when I was at the smallest docal length.. something around 35, I had a similar issue, and it was the lens hood wasn't the correct one for the lens, so you could see it on the edges a little.

Just a thought.

Also - What metering were you using? Not sure if this is hit or miss, but if you spot metered then perhaps the camera was kind of "blacking out" brighter blue parts of the sky? (I could be making this up... not sure.. thought I'd throw it out there)

 

[snowbear117 48]

Did you have any filters stacked on?

 

[Derrel]

It's probably an actual, "normal", and expected amount of light fall-off on that lens's images. If you are using Lightroom, you could click the Enable Lens Corrections box, and enable automatic fall-off removal. It's not at ALL uncommon for even a fine lens to have some amount of light fall-off toward the edges of the frame...it is in fact "expected behavior" with MOST lenses. Especially when the lens is shot wide-open or nearly so. Luckily, removal of this optical flaw is quite easy these days, in software!!! Don't sweat it too much!

 

[charlie76]

I think it's just the light from the moon mildly illuminating the center of the frame.

 

[charlie76]

How about checking another image that is NOT a picture of a big bright ball

 

[Overread17 5]

+1 to Derrel's answer in that its natural light fall off from the lens itself.

If you do have any stacked filters or a different style of lens hood it might also be affecting the amount that you are seeing, but from the amount I can see in the sample shot it looks very slight and more apt to be the lenses construction than flaws or problems. And as said its a very easy fix

 

[enzodm]

Mmm... on full frame or APS-C?
According to Photozone, on APS-C vignetting is low, Canon EF 100-400mm f/4.5-5.6 USM L IS - Review / Test Report - Analysis while is (of course) more visible on full frame: Canon EF 100-400mm f/4.5-5.6 USM L IS - Full Format Review / Test Report - Analysis
In both cases stopping down helps.
Maybe here is a combination of moon light + natural vignetting + filters...

 

[DannyLewis]

no hood on this and the fall off sounds good. It is only day time moon shots when this happens. So it isnt the lens....and no filters either....

 

[ceejtank]

What metering mode were you using

 

[Big Mike]

I think the vignetting is a little exagerated because of the bright subject and it's being in the centre of the frame...but as mentioned, all lenses will show some amount of 'natural' vignetting.

As a test, shoot something that is completely uniform. A piece of paper or clean wall etc. Make sure to fill the frame.

If the camera recorded an even exposure across the whole frame, the resulting histogram should theoretically be a tower, only a few pixels wide....but it's not. The histogram will be tower shaped, but it will have a much wider base, which is because the areas on the outside of the frame will be darker than the centre.

 

[PlanetStarbucks]

Canon EF 100-400mm f/4.5-5.6 USM L IS - Full Format Review / Test Report - Analysis

All lenses have some level of vignetting, even top shelf ones. It's just part of the construction. I would say that the reason it's noticeable on pictures like that is more optical illusion than anything. Your mind's eye is better able to identify the fall off when you have an image that accentuates it (bright object in the center, on a background bright enough to see falloff). On other images, the pattern and colors make it unnoticeable to the mind's eye.