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| Night Time Photography - Page 3 | |
| With D200... | Rating: 
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| Posted: Tue Nov 24th, 2015 18:59 |
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21st Post |
Robert
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This evening I stopped at Glenridding on the shore of Ulswater at about 9pm, the sun has set at about 4pm. There was an almost a full moon high in the sky, almost overhead but lots of fast moving cloud. I set the D200 fitted with Nikkor 20mm f2.8 lens to my heavy tripod and chose manual, 8 seconds at f2.8, ISO400, I set the White Balance to manual, cloudy.  I have played with it in Lightroom a bit but I am a bit limited using the MBP (laptop). Once I get home I can choose the best image more easily and process it. I had intended to stack median process to minimise the noise but the fast moving clouds and reflections pretty well rule that out. Last month, when the moon was at it's maximum, the 'blood moon', was the first time I had spotted this scene, there was no wind or clouds, the brightness was amazing and the reflections in the water were magical. I doubt if I will ever see it so spectacular again but I will try!
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 07:24 |
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22nd Post |
jk
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Now you know where to look I am sure that the opportunity will reoccur. Re the stacking you can in Photoshop select an area with your best clouds and put it onto a different layer then make it top of stack. You can then play with the blending options to get the best effect. 
____________________ 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 08:15 |
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23rd Post |
Robert
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Well yes, but the water mirrors the clouds, so that's ~80%? of the image which is different in each exposure in the stack, the water and clouds suffer just as much from noise as the land mass. A lot of the effect is lost because of the long (8 second) exposure, even ramping the ISO up to an acceptable level would still mean something like 1 second, while that would be better, the movement in 1 second will still kill the sharp reflections which are visible to the human eye. What is needed is less wind! Like it was a month ago... Zero wind and zero clouds. I have been narrowing the candidates down from 54 to half a dozen or so, this morning and I think I missed the best one by far. will have a go at it this evening if I get time. I have noticed a fringe or band on the junction between the sky and the left hand mountain, not sure if it's camera movement or some sort of an 'artefact effect' a form of CA? This is a 1:1 pixel zoom screen grab from Lr.  By way of some sort of control, this is another grab from the same image.  The second grab seems to discount camera shake, the houses and shore line are clearly defined with no secondary edge.
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 11:36 |
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24th Post |
jk
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What lens are you using?. The fringing is possibly/probably CA that you should be able to reduce/remove in LR or Photoshop. However it could be induced by pre-sharpening done by LR in the default import process. Have you zeroed the default import process?
____________________ 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 12:47 |
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25th Post |
Robert
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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. I haven't turned it off, it's not usually a problem. If it's CA then I haven't seen black or dark grey CA before.
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 15:09 |
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26th Post |
Eric
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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. I don't think that is CA. That would show up more around the branches to the right of the frame. It's more like a sharpening or compression artefact or a sort of edge confusion. I don't suppose it's high ISO noise reduction ?
____________________ Eric |
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| Posted: Wed Nov 25th, 2015 16:02 |
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27th Post |
Robert
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The fringing wasn't present on all images, only some batches, mainly those with a full moon, the initial batches, which I dumped due to lack of contrast and interest, were taken with the moon partially obscured. At some point I turned on the shutter delay which delays the shutter releasing after the mirror has lifted. I don't think that has any bearing on this phenomenon, with an 8 second exposure any vibes from the mirror clanking up would be irrelevant. The in camera high ISO noise reduction was set to normal. The screen grabs were from an image which hadn't had any processing in Lr except the import process. I will take a couple of screen grabs of the processed image...
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 16:18 |
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28th Post |
Robert
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First the mountain skyline, the fringe seems to be parallel? Southern shore and lower bush:  Southern shore and upper bush:  I can't be sure but it seems to me there is fringing in the branches of the bush but it's ill defined. If it were coloured it would be much easier to be sure. Given it's grey, will the 'CA de-fringe' command work?
____________________ Robert. |
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| Posted: Wed Nov 25th, 2015 16:28 |
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29th Post |
Eric
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CA means Chromatic Aberration....nothing chromatic about that sky line. Also CA doesn't follow contours as faithfully as that..imho. That's got to be an in camera processing issue???
____________________ Eric |
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| Posted: Wed Nov 25th, 2015 16:43 |
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30th Post |
jk
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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!
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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