cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

Dealing With Vignetting.

Sat May 30, 2009 3:02 am

I shoot with a full frame camera, Canon 5D MK1 and a canon 100-400 f/4.5-5.6 IS lens. Even at f9 I get a decent amount of vignetting. And since I'm shooting against a clear blue sky most of the time it's pretty obvious.

Now I know having the subject centered as much as possible will help to avoid this in the crop. But, I just don't get that all the time. Go figure.  

Of course Photoshop Elements has a filter to remove the vignetting. The problem is it leaves somewhat noticeable set of rings around the image which are really clear when you equalize the image.

Is there a method or adjustment that can be made to eliminate these rings or at least smooth them out?

Or, is there a plugin out there that does a better job of this than photoshop?

[Edited 2009-05-29 20:39:50]
 
ruudb
Posts: 144
Joined: Sun Jun 05, 2005 4:21 am

RE: Dealing With Vignetting.

Sat May 30, 2009 4:23 am

I am not sure if the it is the funtion as in elements but in Cameraraw there is a function behind the lenstab in which you can change the vignetting, you can also set the centrepoint of it, it doesn't make it go away completely, but it works good enough in most cases, in my opinion.
 
cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

RE: Dealing With Vignetting.

Sat May 30, 2009 4:30 am

Hi Ruudb,

Thanks for the reply!  Smile

Yes, elements has the correct camera distortion filter that includes vignetting adjustments including the amount as well as centerpoint. That's what I use but end up getting the rings.

I'm using cameraraw 5.3 on a mac but, I don't see a lens tab or really any tab that contains a vignetting adjustment.  confused 
 
ruudb
Posts: 144
Joined: Sun Jun 05, 2005 4:21 am

RE: Dealing With Vignetting.

Sat May 30, 2009 4:47 am

I have an older version, I think using CS3 with the latest version of cameraraw working on CS3, but I suppose they didn't change the functions.
It is called the lens corrections tab, the 6th tab, maybe it is called different in 5.3, but there is a drawing of some lenses on it.
You won't get rid of all vigneting if you look in equalize, but it will work for the eye.
 
cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

RE: Dealing With Vignetting.

Sat May 30, 2009 5:03 am

I'm going to guess the cameraraw versions between mac and windows are different.

Here's a screenshot of what I see....

http://homepage.mac.com/cvervais/cameraraw.tiff

Never mind the big ugly dust spot, I got it off the sensor when I got home.  embarrassed 
 
ruudb
Posts: 144
Joined: Sun Jun 05, 2005 4:21 am

RE: Dealing With Vignetting.

Sat May 30, 2009 6:35 am

I looked at it and you are right it is different, maybe it is in the camera tab?
It is strange that these version are different! In windows there are 7 tabs.
 
cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

RE: Dealing With Vignetting.

Sat May 30, 2009 7:24 am

Nah, the camera tab just has camera profile information.  boggled 
 
cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

RE: Dealing With Vignetting.

Sun May 31, 2009 3:52 am

Here's a example showing the "rings" in the image caused by the vignetting "correction" in photoshop. It's noticeable to my eye at least.

http://homepage.mac.com/cvervais/airliners/cvervais-N741FD_514.jpg

What am I doing wrong?
 
cvervais
Posts: 551
Joined: Thu Sep 11, 2003 8:38 am

RE: Dealing With Vignetting.

Sun May 31, 2009 5:21 am

I may have found a solution but, is it cheating? After making the vignetting adjustments if I select the entire sky in a shot like linked above and choose the average filter it very nicely averages the whole sky.

This vignetting problem with the banding only haunts me when there's nothing in the background but sky so this is the only situation I'd have to use the average filter.

Here's a edit employing that method.

http://homepage.mac.com/cvervais/air...s/cvervais-N741FD_514-averaged.jpg

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