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| It's Geminid Meteor Shower Time Again - Page 3 | |
| 13th - 14th December 2015 | Rate Topic |
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| Posted: Sat Dec 12th, 2015 09:47 |
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21st Post |
Eric
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Robert wrote:Eric wrote: Ah yes, silly me....was forgetting this was for meteor capture, and thinking just star shots.
____________________ Eric |
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| Posted: Sat Dec 12th, 2015 10:55 |
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22nd Post |
jk
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Even for star shots and astrophotography people seem to recommend using a fast wide angle lens e.g. 20-35mm and if possible a fast aperture such as f2.0 or f2.8 but used at f4.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sat Dec 12th, 2015 16:46 |
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23rd Post |
Eric
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jk wrote:Even for star shots and astrophotography people seem to recommend using a fast wide angle lens e.g. 20-35mm and if possible a fast aperture such as f2.0 or f2.8 but used at f4. Yes I have seen that before and never asked why? I naively assumed using a long lens would get a tighter field of view requiring lens post cropping....which for other photography is preferred when you cannot get closer to the subject. Maybe with stars, the distances involved are immaterial? But I would have thought pictorially if the noise /grain is too large (relative to the 'light dots') as a result of enlarging/ cropping ...it would be better to do less cropping and use long lens??? Or perhaps with median stacking etc noise size becomes irrelevant? As I say...don't understand the 50mm logic. 
____________________ Eric |
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| Posted: Sun Dec 13th, 2015 03:34 |
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24th Post |
jk
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Dont forget the Geminids shower on December 13th and 14th nights but there are others. See this. Attachment: image.jpeg (Downloaded 20 times)
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun Dec 13th, 2015 03:48 |
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25th Post |
jk
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Next years events. http://www.cute-calendar.com/category/meteor-showers.html
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun Dec 13th, 2015 11:56 |
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26th Post |
Eric
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With unbroken cloud and light rain forecast for next 48hrs, I will have to look elsewhere on another date.
____________________ Eric |
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| Posted: Sun Dec 13th, 2015 15:28 |
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27th Post |
jk
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Clear skies to the south. Showering! My first serious try at this astro/star photography stuff. I have set camera to auto-shoot 25 frames 1 minute apart of 12 seconds at f4 at ISO1600. There is a bit of light to the south from a major town (Denia) but I will see what happens. I wont get a chance to process the images until tomorrow evening as I am busy tomorrow during the day.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun Dec 13th, 2015 16:56 |
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28th Post |
jk
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Early look, no meteors! :-( Well there is always tomorrow.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun Dec 13th, 2015 17:27 |
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29th Post |
Robert
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I took the boys out last night Sat 12th Dec. at ten pm, we got back at three am! Been plastering all day. Trying to make something of the images, I have one capture of a meteor, on the D300s with the Nikkor 20mm 2.8; 15 seconds @ f4. Also caught an aircraft in about 10 images of the same stack! It must have been flying low over the Lakes, may have been a helicopter? Christopher estimates he saw about 20 meteors during the outing. He was very impressed. Michael helped setting up the cameras and managed the catering... Anybody watching us would have thought we were fresh from the Mad Hatters Tea Party! LOL Christopher was lying on his back on the frozen ground (watching for meteors), I was running from camera to camera checking them and Michael was dishing up doughnuts and sausage rolls in total darkness, well almost, there was no moon. Working on the meteor image, a bit of light pollution and amplified noise I think. A touch of CA, the stars are mostly pure white, so probably blown. I think 15 seconds may have been a bit too long, ten may have been better. The 20mm f2.8 seems to need a longer exposure than the 50mm f1.4 at f4 on the same body. Don't quite understand that. I am getting a better understanding of the median stacking process, aligning the stars is the biggest problem. Will describe it more fully in another post. I am devising a workaround, the issue is alignment of the 'rotating' stars coupled with interference from passing clouds and some other factor which is messing the Ps Auto Align up.
____________________ Robert. |
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| Posted: Sun Dec 13th, 2015 17:43 |
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30th Post |
Eric
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Robert wrote:I took the boys out last night Sat 12th Dec. at ten pm, we got back at three am! Been plastering all day. Trying to make something of the images, I have one capture of a meteor, on the D300s with the Nikkor 20mm 2.8; 15 seconds @ f4. Also caught an aircraft in about 10 images of the same stack! It must have been flying low over the Lakes, may have been a helicopter? Just playing the devils advocate.....why such long exposures? If you under expose the image you can always boost highlights ie. white dots in PS, without influencing the dark sky. It may not be the proper way to do it but frankly they will never be more than white dots so burning them out won't lose detail that's not visible anyway!  Attachment: image.jpeg (Downloaded 17 times)
____________________ Eric |
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