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| Night Time Photography - Page 4 | |
| With D200... | Rating: 
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| Posted: Wed Nov 25th, 2015 17:02 |
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31st Post |
Eric
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jk wrote:I have seen similar effects with oversharpening but that halo effect at the edge of light and dark areas I have seen before. I know you here is a solution. I will need to do some searches! Over sharpening tends to give high contrast halos. That's more like a noise reduction over cook. 
____________________ Eric |
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| Posted: Wed Nov 25th, 2015 17:04 |
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32nd Post |
Robert
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It seems to be at the (distinct) boundary between dark and light areas. I opened the original NEF in ACR and zoomed in to 400%. There appears to be a light fringe at the light side of the grey fringe. Screen Shot of ACR: 
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 17:10 |
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33rd Post |
jk
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Robert wrote:Nikkor 20mm f2.8 D. The image I took the grabs from had not been processed by me, although as you say it will have had the preliminary Lightroom initial import process. If you go into the Develop module all value should be zero. Sometime the defaults the LR applies are horribly wrong! Take a single image that looks to show the haloing effect and try processing it in Photoshop. Are the results the same as from LR?
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Wed Nov 25th, 2015 17:43 |
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34th Post |
Eric
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Robert wrote:It seems to be at the (distinct) boundary between dark and light areas. There is a small element of CA on that image enlargement in the blue red...but it's not causing that thick edge effect. You can try using the CA reduction filter in the ACR interface. Move the red blue slider...but I bet it won't get rid of that edge effect. I hate to say it, but do you think it's a limitation of the D200 sensor? The D200 did suffer from Line Noise at high ISOs. I wonder if this is some sort of manifestation of that sensor issue? I guess the only way to check this is repeating the shots under test control conditions using different lenses and different camera settings. There is such a thing as blooming ....the spill of over exposed pixels into adjacent darker pixels. This obviously happens along contrast edges. I have always assumed the pixels neeed to be over exposed to create this spill over but maybe to some degree it happens along any light/dark interface??? Groping in the dark a bit here.
____________________ Eric |
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| Posted: Thu Nov 26th, 2015 02:26 |
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35th Post |
jk
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I think that Eric is correct. The limitation may indeed be in the D200 sensor. I know I have seen this effect before and the reason for its occurrence but I cant remember what it was. Robert, has this camera been Full Spectrum converted? It may be that the conversion has induced a limitation in the camera.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Thu Nov 26th, 2015 02:42 |
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36th Post |
Eric
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jk wrote:I think that Eric is correct. The limitation may indeed be in the D200 sensor. I know I have seen this effect before and the reason for its occurrence but I cant remember what it was. I thought this was Roberts colour D200 not the one converted to IR?
____________________ Eric |
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| Posted: Thu Nov 26th, 2015 04:29 |
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37th Post |
Robert
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Thank you gentlemen! It's hard to replicate the conditions at will, I intend to keep trying in this challenging aspect of photography. Had it not been for the moon it would have been very dark, indeed it was pretty dark as it was, I am amazed the D200 sensor picked up the amount of detail revealed in the full image in post 21, I feel it's truly remarkable. I definitely couldn't see any of the colours with my naked eye which are clearly visible in the photograph above, all I saw was a black mountain side. I can, and as an experiment I probably will remove the fringe from the mountain skyline, if only manually. I will also try various stacking median blend experiments when I get home from visiting my Daughter. I am actually quite impressed how little noise is in the image, OK not technically excellent but not disastrous either. I will have a closer look at all the images I took that session once I get home, there may be some room for recovery once I have a bit more screen 'elbow room'. I will try importing two batches one for Lightroom and a second separate import solely for Photoshop, that may help clear up whether Lr is messing with the import process by over processing the image. Eric is right, it's my normal, un-mollested D200! I suspect the full spectrum D200 would possibly not have suffered this issue. Again perhaps room for experiments.
____________________ Robert. |
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| Posted: Thu Nov 26th, 2015 10:47 |
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38th Post |
Eric
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Robert wrote:Thank you gentlemen! I knew it was Robert. I took all the fringing settings off the IR body.  But ...you could next time try shooting the same shot with the IR body as well...to see if the fringe is there with that sensor. 
____________________ Eric |
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| Posted: Thu Nov 26th, 2015 11:50 |
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39th Post |
Robert
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Eric wrote:But ...you could next time try shooting the same shot with the IR body as well...to see if the fringe is there with that sensor. I am convinced the D200-IR body produces far crisper images than my D200. The standard LPF filter has a slight blurring effect to combat moire.
____________________ Robert. |
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| Posted: Thu Nov 26th, 2015 11:56 |
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40th Post |
jk
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Robert wrote:Eric wrote: That makes sense and is why Nikon now seem to be removing the use of the LPF in their cameras.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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