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Rainbow fringing in sun/snow photos

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 Chris Craggs Global Crag Moderator 09 Feb 2016
I have been processing some shots and in many of the sunny/snow ones there is a distinct 'rainbow' fringing round the edge.

Sample here: http://www.ukclimbing.com/images/dbpage.php?id=270179

Anyone any idea what is causing this and how to remove it? I have spent some time in Lightroom - most attempts make it worse rather than better.

Camera is a Sony RX10 (Zeiss 28-200mm lens) and it appears to be a problem at the wide end.

Cheers


Chris
 Fraser 09 Feb 2016
In reply to Chris Craggs:

I've no real idea tbh, but when you use Lens Correction in LR, what does it affect - does it influence the rainbow fringe you see? Is it more apparent in snow shots?
OP Chris Craggs Global Crag Moderator 09 Feb 2016
In reply to Fraser:
Apparently the Lens Correction is applied automatically to the RAW file - I have tried fiddling with lens correction, colour correction and vignetting and none make much visible difference.

I wonder if it something to do with the altitude and the sensor picking up UV or something similar,


Chris
Post edited at 12:25
 Durbs 09 Feb 2016
In reply to Chris Craggs:

Odd - not seen that before.

You could cover it with a vignette, or possibly a targeted de-saturate with more luminance...
 Brian 09 Feb 2016
In reply to Chris Craggs: Did you have a lens hood on or off ??

OP Chris Craggs Global Crag Moderator 09 Feb 2016
In reply to Brian:

Lens hood on,


Chris
In reply to Chris Craggs:

Have you got a fixed lens you could use for your wide-angle shots, rather than that very big zoom? It must be a problem with the optics with a very small aperture when lens zoomed right out.
 Fraser 09 Feb 2016
In reply to Chris Craggs:

> Apparently the Lens Correction is applied automatically to the RAW file...

Really? I'm fairly sure I always have to deliberately activate the apply LC commend, even to RAW files. Must check tonight.

I didn't really notice the rainbowing on your image till I looked for it, but once you spot it, it is noticeable. Found this link which might be useful:

http://photo.stackexchange.com/questions/57911/weird-rainbow-colored-chroma...

A final question: is the rainbow present before you do any adjustments in LR?
 HeMa 09 Feb 2016
In reply to Gordon Stainforth:

Considering the RX10 is not a system camera, changing the lens might be tad hard...
In reply to HeMa:

Sorry, didn't look up what the camera was. But it does look a bit like a limitation with that camera in those conditions.
OP Chris Craggs Global Crag Moderator 09 Feb 2016
In reply to Fraser:

> Really? I'm fairly sure I always have to deliberately activate the apply LC commend, even to RAW files. Must check tonight.

There is a small 'i' at the bottom of the profile tab that says "This raw file contains a built-in lens profile for correcting distortion and chromatic aberration. The profile has already been applied automatically to this image."

> A final question: is the rainbow present before you do any adjustments in LR?

It is there but less pronounced, any kind of tweaking seems to enhance the colours. Thanks for the link btw,


Chris
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