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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 02 Nov 2008 (Sunday) 00:56
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To Stack or not to stack.... That is the Question

 
bowtie`
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Gallery: 26 photos
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Location: Indiana, USA
     
Nov 02, 2008 00:56 |  #1

Last night I figured I would do an experiment on the differences of stacking versus ultra-long exposures. I see why now that stacking is so prevalent. The increase in contrast is much better. Both of these images total 40 minutes of exposure. The first image (landscape mode) is 40 minutes with a single exposure. The second image (portrait mode) is 4 images of 10 minutes exposure each stacked in registax. (I just downloaded DSS but can not open the files :cry: ). Both images were taken with a 5D, ISO 125, AV 5.0, Lens 24-70mm @24mm. Noise reduction was on with all images.


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Adrena1in
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Location: Winchester, Hampshire, UK.
     
Nov 02, 2008 06:55 |  #2

It's a tough one really. I would like to do single long exposures, but I get so many hot pixels they ruin it. These can be removed or cleaned up a bit using stacking.

One thing I will say though...something changed after the first shot of your stack, didn't it? The first segment of each trail is brighter than the rest. ?

Oh, and great shots by the way! :)


Canon EOS 450D, Sigma 18-200mm, Canon 50mm f/2.5 Macro, 2x TC, Revelation 12" f/5 Dobsonian, Mintron PD2285-EX webcam.

  
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Celestron
Cream of the Crop
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Nov 02, 2008 16:28 |  #3

Looks good , kinda bright tho . Maybe try a different shutter setting like maybe f/6.3 .




  
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bowtie`
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Location: Indiana, USA
     
Nov 02, 2008 18:49 |  #4

Adrena1in wrote in post #6607802 (external link)
It's a tough one really. I would like to do single long exposures, but I get so many hot pixels they ruin it. These can be removed or cleaned up a bit using stacking.

One thing I will say though...something changed after the first shot of your stack, didn't it? The first segment of each trail is brighter than the rest. ?

Oh, and great shots by the way! :)

Thanks! I can not figure out if the intensity problem is part me or part the stacking software. Sometimes I have to try stacking four or five times to get the intensity similiar. Sometimes it never does. Part of the problem is me taking the shots. My hillbilly shutter controller ( a pen nub and velcro straps ) does not lend itself to exact exposures. I end up wrapped up in looking up with the binoculars or just walking around and I forget to look at my watch and can miss exposures by a minute or two. I try to equalize them first but I probably miss more than I hit.

Celestron wrote in post #6610169 (external link)
Looks good , kinda bright tho . Maybe try a different shutter setting like maybe f/6.3 .

Thanks! I will try some with some small aperatures in the future.




  
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BIRDSMARTIN
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154 posts
Joined Jul 2007
Location: Belleville, Ontario. Canada
     
Nov 03, 2008 02:01 |  #5

Love the complete circle affect I am reading up on the stacking method, have downloaded the free stacking program and will have to try it sometime. Great work!




  
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Adrena1in
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Location: Winchester, Hampshire, UK.
     
Nov 03, 2008 02:53 |  #6

BIRDSMARTIN wrote in post #6613088 (external link)
Love the complete circle affect ...

At the moment I'm hoping to get some clear skies around the shortest day, so that I can set up my camera and go for as many subs as possible from dusk until dawn, to see how much of a trail I can manage. My fear would be serious camera over-heating and/or dew on the lens though. (Not sure how happy a £1000 camera and lens would be if left outside for about 11 or 12 hours on a cold winter's night!!)


Canon EOS 450D, Sigma 18-200mm, Canon 50mm f/2.5 Macro, 2x TC, Revelation 12" f/5 Dobsonian, Mintron PD2285-EX webcam.

  
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To Stack or not to stack.... That is the Question
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
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