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Topic: Vignetting And Rejecting Rules
Username: gluque
Posted 2012-11-04 11:30:42 and read 5828 times.

Hello, first of all, sorry for my English...it´s elementary. I need your help....

I have just bought a new D800, and I have been using it with my lovely Sigma 120-300 HSM. I have been looking that this combination produces a lot of vignetting. I could remove the vignetting using a Camera Raw, but, when I equalized the photo (in PS) I could see a circular halo, which is not visible in the normal view.... In summaries, I can remove the vignetting in the normal view, but when I equalized the image I can see a circular halo just in the point where the original vignetting started. I need to know if this "halo", in the equalized view, is a rejection reason... I know that I can shoot in crop mode (in order to avoid the vignetting), but the idea is to take advantage of the powerful camera sensor.

Thanks and best regards from Argentina.

Topic: RE: Vignetting And Rejecting Rules
Username: Silver1SWA
Posted 2012-11-04 12:02:48 and read 5816 times.

For this website you do not need that full resolution from the D800. You don't even need half!

I'm still relatively new to Full Frame myself and vignetting is something I still struggle to correct without showing signs of fixing it like you pointed out. Right now I stick to my 7D for most aviation stuff due to the crop.

Topic: RE: Vignetting And Rejecting Rules
Username: dlowwa
Posted 2012-11-04 12:37:38 and read 5808 times.

Quoting gluque (Thread starter):
I need to know if this "halo", in the equalized view, is a rejection reason..

Yes, both vignetting and editing halos are reasons for rejection.

Topic: RE: Vignetting And Rejecting Rules
Username: dazbo5
Posted 2012-11-05 01:01:40 and read 5724 times.

Just a suggestion, what apertures are you using? You may find if you use a smaller aperture, the vignetting reduces or dissapears. For example, on the Sigma 10-20 EX lens I use, vingetting is aparent until f/8. If the light is good enough, stopped down to f/10, there's no vingetting so you may be able to reduce the effect rather than having to remove it in post-processing.

Darren

Topic: RE: Vignetting And Rejecting Rules
Username: ptrjong
Posted 2012-11-06 03:39:25 and read 5709 times.

Quoting dlowwa (Reply 2):

But you don't equalize images to check for things, or do you?

Topic: RE: Vignetting And Rejecting Rules
Username: scbriml
Posted 2012-11-06 04:25:02 and read 5709 times.

Quoting ptrjong (Reply 4):
But you don't equalize images to check for things, or do you?

Speaking from personal experience during my short spell as a screener, not normally, no.

It's surprising how quickly a new screener becomes very good at seeing dust spots and halos without needing to equalise the image. I only ever equalised a couple of images I was screening and that was to look for suspected "illegal editing".

Quoting gluque (Thread starter):

Are you shooting jpeg or raw? One thing to watch out for on newer Nikons if shooting jpeg is that "Active D-Lighting" is turned off. It will often result in halos around aircraft, especially if shot against a blue sky. I don't believe the D-Lighting setting has any affect on raw files.

Topic: RE: Vignetting And Rejecting Rules
Username: alevik
Posted 2012-11-06 10:33:06 and read 5709 times.

Quoting ptrjong (Reply 4):
But you don't equalize images to check for things, or do you?

No we don't equalize during screening - here is no tool to do this in the screening page, you would have to save the image and open in Photoshop. As noted we do sometimes do this, but rarely and not for simple things like halos or dust spots.

Halos and dust spots are typically seen by "grabbing" the image browser window and circling it. They show up quite readily then.

Topic: RE: Vignetting And Rejecting Rules
Username: vikkyvik
Posted 2012-11-06 11:17:06 and read 5709 times.

Quoting alevik (Reply 6):
No we don't equalize during screening - here is no tool to do this in the screening page, you would have to save the image and open in Photoshop.

Just an FYI, you don't have to do that. You can drag an image from the web browser window right into Photoshop.  

Topic: RE: Vignetting And Rejecting Rules
Username: mlevert
Posted 2012-11-07 13:58:17 and read 5709 times.

Quoting scbriml (Reply 5):
I don't believe the D-Lighting setting has any affect on raw files

I think it still does, however I've only noticed it on "flat" aircraft. Prior to learning that you need to turn the active D-lighting, I shot an airshow and all of the F-22 and B-2 I took pictures had halos when shooting RAW.

Topic: RE: Vignetting And Rejecting Rules
Username: gluque
Posted 2012-11-09 13:21:19 and read 5709 times.

Hello, I appreciate your comments, they are very important for me. I know the problems with "D-Lightning" and I never use this tool. This week, I talked with some professionals about this problem, and I took a lot of advices. Some guys recommend me to use "Capture One" in order to edit the RAW files. They comment me that "Capture one" has a powerfully tool in order to reduce / avoid the vignetting. I don´t know if is true... but, next weekend I will send my comments. Thanks and best regards from Argentina.


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