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Weird Spiral Patterns High ISO D850???

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Arretose

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While editing D850 photos of the Milky Way in Lightroom Classic CC, I noticed some weird spiral patterns when (examples below) zooming in at 100%, The patterns get much more noticeable when I make edits in Photoshop (Levels/Curves). As I recall, I used the mechanical shutter, not the electronic. I opened the same file in View NX-i and Capture NX, and I am not seeing the pattern at all. It leaves me to believe it may have something to do with how LR is reading the file? Has anyone seen this before, and know what it could be?



ISO 6400

10 sec

14mm (14-24)

f/2.8



b6a09f05a79843cd99634e28edabafa2.jpg.png




b98a2cb281de471893b3ffde47462009.jpg.png




fc72f81bb2b4422086d1c8ef6528397a.jpg.png




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Chris
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Christopher Ross

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That looks like moire. But I don't have an explanation for it...

Not the sort of moire caused by an interaction between the regular pixel pitch of the sensor with a pattern in the image... more like an interaction between two elements of the image, like the sort of moire you get when you have interaction between an image and a reflected part of the image (eg caused by a filter) ie more like an interference pattern.
 
Last edited:
Arretose said:
A few more examples with the 20 f/1.8

9799f16116614da8bac3783c0a1fac18.jpg.png


2f56e0ab3b084fdea01b62f47256adea.jpg.png


--
Chris
http://www.flickr.com/photos/crossphotography/
Click to expand...
Clearly, there is a black hole in the vicinity, and you have captured evidence of its gravity waves. :-)

On a more serious note, I suspect Lightroom is performing some distortion or vignetting or other correction, and not doing a very nice job of it.

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Messing around in LRClassicCC, I am able to nullify this effect by turning down detail all the way in the Detail module. Detail settings were as listed below. I'm wondering if I am overbaking my images and causing the pattern?

Sharpening

Ammount: 50

Radius: 1

Detail 100

Masking- to taste depending on the scene.



2d074c8c944f4f04bea327ac00d51fe1.jpg.png




--
Chris
www.flickr.com

Christopher Ross

Explore Christopher Ross’s 848 photos on Flickr!
www.flickr.com www.flickr.com
 
I seldom go over 25, but thats with a D750. Do you have lens correction turned on? Try turning it off if yes?
 
sandy b said:
I seldom go over 25, but thats with a D750. Do you have lens correction turned on? Try turning it off if yes?
Click to expand...
Sharpening wouldn't produce the effect, as it acts locally, unless the pattern was already there, just brought to view by sharpening.

It looks like some interference pattern, like Newton rings. Maybe long exposure effect, plus LR problem. Difficult issue, as not present with Nikon soft.
 
Check if it happens at low isos and longer exposures. This must be further investigated, if coming from long exposure or high ISO. There is a way to simulate it in a lab, but it's a lot of work.

Looks like some interference pattern.
 
Try your NEF with Nikon NX-D. Free off the web and much preferred treatment of Nikon RAW. However does not have the same tools as PS/LR.

Expect your circular pattern will go away.
 
six34sigma said:
Try your NEF with Nikon NX-D. Free off the web and much preferred treatment of Nikon RAW. However does not have the same tools as PS/LR.

Expect your circular pattern will go away.
Click to expand...
 
So it does. Apologies.
 
It looks like Light Room Classic CC causes the effect when the lens profile is turned on (check marked) under the Lens Correction Module. I would be curious to know if I am the only one that is seeing this, or if it as a more widespread issue that Adobe will hopefully address.
 
From what I understand, Adobe uses a form of the "adaptive homogeneity-directed" algorithm for demosaicing, which has the good effect of preserving hard edges and reducing zipper artifacts but can lead to maze artifacts. Other makers, as you discovered, use different algorithms which make different compromises and so have different artifacts. Some algorithms produce color artifacts, which are eliminated by color blurring, while others produce softer edges.

The solution is to use a high megapixel camera with a lousy soft lens. :-)

Or use a different raw converter. As noticed, increasing contrast, sharpness, or even saturation can boost the artifacts.
 
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