| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4424 |
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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.
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!
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Last edited on Sun Dec 13th, 2015 18:59 by Eric
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Eric