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| It's Geminid Meteor Shower Time Again - Page 4 | |
| 13th - 14th December 2015 | Rate Topic |
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| Posted: Mon Dec 14th, 2015 02:41 |
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31st Post |
Robert
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It was in the back of my mind Eric. My 'test' exposures were made on the basis that the shorter exposures didn't reveal the smaller stars, just the larger ones, but maybe the viewing screen on the back of the camera isn't the best viewer? In the dark I found it hard to zoom in and check the detail, but I now feel the long exposures were wrong, it's hard to put the genie back in the bottle once it's in the image but I wanted to be able to capture the meteors, the only two I captured were quite faint but unlike the stars they were orange, the same as the clouds and the light polluted sky. I later concentrated on the darker sky and there are plenty of stars in the images, maybe there would still have been had I made shorter exposures?
____________________ Robert. |
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| Posted: Mon Dec 14th, 2015 08:43 |
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32nd Post |
Eric
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Robert wrote:It was in the back of my mind Eric. To be honest I was surprised how much movement there was in the stars on my image considering it was only 4secs for the eclipsed moon...as well as the moon itself. In contrast the normal moon shot at 1/125th is much sharper but the stars on that image didn't show at all. I might be inclined to have a play at this myself ...when we get clear skies again! If you put the camera on continuous, set a fast shutter speed and high ISO and just rattled off 5or6shots, you could stack them to reduce noise and then boost the highlights ( or do that before median stacking maybe) ?
____________________ Eric |
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| Posted: Mon Dec 14th, 2015 08:47 |
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33rd Post |
jk
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Result from last night. Single image taken on XT1 with 14mm f2.8 lens. Exposure 15secs f4 ISO1600. Attachment: XT1-1-5796.jpg (Downloaded 16 times)
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Mon Dec 14th, 2015 08:49 |
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34th Post |
jk
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Looking at the whole set of 25 images it is obvious that there is progression so a polar mount with tracking would be a nice thing to have if you want to use all the image area from all the images in a set.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Mon Dec 14th, 2015 09:42 |
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35th Post |
Eric
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jk wrote:Result from last night. What's also good about that shot is the colour rendition. Betelgeuse and Aldabaran show up clearly red, compared to the other blue and white stars.
____________________ Eric |
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| Posted: Mon Dec 14th, 2015 10:53 |
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36th Post |
Robert
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Eric wrote:To be honest I was surprised how much movement there was in the stars on my image considering it was only 4secs for the eclipsed moon...as well as the moon itself. In contrast the normal moon shot at 1/125th is much sharper but the stars on that image didn't show at all. The 15 sec exposures produce a lot of stubby white sausages! I think you may be onto something with the fast 'mini stacks', at say 60 or 125th, then combining them. The intervalometer can cope with that I think. Setting the shutter to continuous slow (or fast?), the burst of four or five rapid exposures repeated every every 20 seconds. Apart from the actual capture, the other issue I have been having has been the refusal of Photoshop to 'Auto-Align' the stacked images (in layers). Some will, others won't. I had this issue with the panoramas, I allowed almost 50% overlap on most of my pano exposures but frequently Lightroom refused to assemble then saying there wasn't sufficient overlap. Photoshop did no better with the same images. I believe the same panorama creating engine is used in both Lr and Ps. As I use Lr for most all of my images I have taken to testing each batch of images I intend to stack by trying to get Lr to create a panorama, if it makes a successful attempt then I cancel and import those images into Ps as layers, each time I have tried it in Lr first it then works in Ps. I have seen it written that converting the NEF to a Photoshop document (.psd), results in a greater success rate... The other idea I had was to use the PTGui layers alignment software which is used to align images for panoramas, after all these images are in a way identical to panoramas except that they are overlapping about 99.9%, but I'm not sure how to get the aligned images into Ps as layers without allowing PTGui to actually create a panorama...
____________________ Robert. |
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| Posted: Mon Dec 14th, 2015 11:02 |
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37th Post |
Robert
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Eric wrote:jk wrote: They are SUPPOSED to be coloured??? I thought it was CA again!  I obviously need a crash course on stars! I thought they were all white.
____________________ Robert. |
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| Posted: Mon Dec 14th, 2015 14:23 |
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38th Post |
Eric
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Robert wrote:Eric wrote: Red giants are out there. 
____________________ Eric |
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| Posted: Mon Dec 14th, 2015 23:45 |
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39th Post |
amazing50
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I was planning on my Sigma 35 f1.4 but Ontario has been to warm, +9C at midnight and drizzle with fog.
____________________ There is nothing worse than a sharp image of a fuzzy concept ;~) Mike Grace |
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