Purple blotches!!

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Royer
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Posted Tue Sep 25, 2012 8:46PM
Had a problem today that haven't seen before, and can't figure out. Took some pics of a gathering storm cloudscape. Had of course a mix of grey tones.  But, also had splashes/blotches of purple coloring -- not just fringing,  but blotches. Used D800 and Zeiss 35 mm  2.0. All settings for things like sharpness, contrast, etc set at 0. Shot in Raw.  ISO at about 100.


Any idea what is causing this?? I still have time to return lens (which I had high hopes would be as good as my Zeiss 100Makro). But, if some weird camera setting might be the culprit, would hope to fix that first.  


Thanks for any insights.

(Edited on 2012-09-25 20:47:58 by Royer)
pink_cotton_candy
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Posted Tue Sep 25, 2012 9:06PM
you might share an image or two as examples
kelvinjay
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Posted Wed Sep 26, 2012 6:09AM
Yeah, sounds weird but hard to diagnose without seeing the image and issue.

Post a link to an affected image and I'm sure someone here will be able to help figure it out.
Ekspansio
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Posted Wed Sep 26, 2012 8:53AM
From what you describe I don't think it's the lens, more likely your camera settings. Was Active D-Lighting or Vignette Control on?
ClarkandCompany
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Posted Wed Sep 26, 2012 11:28AM

I usually come out in a Zeiss Purple Blotch rash due to envy....you seem to have the Nikon version of this problem...


Seriously could it be moisture spots on the lens refracting..... You said it was stormy?  But difficult to say without seeing it.
ChristopherBernard
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Posted Wed Sep 26, 2012 2:49PM
Sounds like banding maybe.
Royer
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Posted Wed Sep 26, 2012 3:11PM
I'll check some of the suggestions.  Have to admit -- with great embarrassment -- that I don't know how to upload an image that is not already on IS. (URL, etc.)

(Edited on 2012-09-26 15:12:06 by Royer)
kelvinjay
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Posted Wed Sep 26, 2012 3:17PM
Just upload the shot to an image host, there's plenty of free ones that should be able to show an image big enough for us to get an idea of what you're seeing. Try Dropbox, Photobucket, Flickr etc and just copy and past the link here. Don't worry about making it clickable.

(Edited on 2012-09-26 15:18:43 by kelvinjay)
cmannphoto
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Posted Wed Sep 26, 2012 3:18PM
Posted By Royer:
I'll check some of the suggestions.  Have to admit -- with great embarrassment -- that I don't know how to upload an image that is not already on IS. (URL, etc.)

(Edited on 2012-09-26 15:12:06 by Royer)

Take a look at what Donald has written in the Critigue Request Sticky for using Dropbox
keithferrisphoto
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Posted Wed Sep 26, 2012 6:21PM
What was your shutter speed?
Royer
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Posted Wed Sep 26, 2012 7:26PM
Will double check. I varied apertures in tests from around 2.8 to 5.6 to 8.0.  So, some SS's  were very fast (1/700+), and some we're slower (1/300).  In general, pretty fast. Also, shot on monopod and in "Neutral" .  
lucentius
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Posted Thu Sep 27, 2012 12:25AM
Could it be lens flare due to shooting into the light? Are they in the same place on the image frame for each shot?

(Edited on 2012-09-27 02:07:28 by lucentius)
esp_imaging
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Posted Thu Sep 27, 2012 5:05AM
Posted By lucentius:
Could it be lens flare due to shooting into the light? Are they in the same place on the image frame for each shot?

(Edited on 2012-09-27 02:07:28 by lucentius)

This woould be my guess, but without seeing photos, it's all guesses.
slobo
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Posted Thu Sep 27, 2012 10:25AM

I never had luck photographing sky with my Canon 5D or 5DmkII with any lens. I think that camera naturally underexposes sky. Correcting exposure in post processing usually brings all kinds of artifacts.


So, you may be experiencing "natural" phenomenon for digital cameras.
wdstock
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Posted Thu Sep 27, 2012 8:13PM
Have you tried the lens on another body?
lucentius
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Posted Fri Sep 28, 2012 3:38AM

Like this?


http://www.petapixel.com/2012/09/26/iphone-5-has-purple-flare-possibly-the-same-issue-that-plagued-the-leica-m8/
wdstock
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Posted Fri Sep 28, 2012 3:56PM
Exactly which lens is this? Is it a non-retrofocus design (where you have to keep the reflex mirror up because the lens extends into the body similar to some Leica lenses)?

(Edited on 2012-09-28 15:56:35 by wdstock)
Royer
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Posted Fri Sep 28, 2012 4:06PM
/
/Here are links to a few of the images that concern me.  Upon testing, it seems that this purple blotching happens both with the Zeiss 35mm lens and with my trusty Nikon 24-70.  Therefore, I'm thinking it is a camera setting.  However, I have all adjustments set on off, shot in 'Neutral' style, etc.   Here are the samples shot at varying apertures and both with the Zeiss and the 24-70 -- note the purple coloration on the undersides of the clouds where there should be shadows.


Zeiss 35mm lens, f5.0, 1/1250 SS:  


http://dl.dropbox.com/u/108955656/_DSC0720.jpg 


Zeiss 35mm lens, f8.0, 1/500 SS:  


http://dl.dropbox.com/u/108955656/_DSC0768.jpg


NIkon 24-70 @ 36mm, f8.0, 1/640 SS: 


http://dl.dropbox.com/u/108955656/_DSC0782.jpg


Nikon 24-70 @ 36mm, f5.6, 1/800 SS:  


http://dl.dropbox.com/u/108955656/_DSC0788.jpg


I've taken such shots before with the 24-70 and many times with the D3x and D2x without this result. Am mystified and frustrated by this.  So, any suggestions you can offer as to what is causing this will be very, very welcome.


Thank you,


Bill

(Edited on 2012-09-28 16:12:37 by Royer)
kbwills
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Posted Fri Sep 28, 2012 6:33PM

I looked at the first two images - on my bog-standard Dell screen - I couldn't really identify any 'purple blotches' on the cloud undersides.


I could see some Chromatic Aberration on both images (e.g. on the structure on the first image and on the buildings in the second) but it didnt really come acros as 'purple blotches' - might be my eyesight ,,, maybe others can see the effect you notice..


REGARDS
Royer
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Posted Fri Sep 28, 2012 7:22PM
Posted By wdstock:
Exactly which lens is this? Is it a non-retrofocus design (where you have to keep the reflex mirror up because the lens extends into the body similar to some Leica lenses)?

(Edited on 2012-09-28 15:56:35 by wdstock)

It was a Zeiss 35mm f2.0.  But, the effect also happened with my Nikon 24-70.
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