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Optimum Exposure Length GAS Astrophotography Interest Group · Tim Ellison · ... · 3 · 69 · 1

Tim.Ellison 0.00
Tim Ellison
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Hi all.

Whilst randomly browsing images in AstroBin I happened upon this one - https://astrob.in/agsyir/0/.

I thought it might be worth sharing - following the discussion on Monday - as it gives an alternative take on the subject of exposure lengths. Not everybody will like the idea of the number of frames involved though, I'm sure!

All the best

Tim
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MartinBaker@1848 0.00
MartinBaker@1848
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Well, that lot will slow up the PC. Blooming lovely result and shows it’s total integration time that is needed.
Being sad I had to work the figures out.
Ha 3.3 Hrs
L 2.1 Hrs
RGB 0.5 Hr each 
In rough numbers.
1.5 & 2 sec subs. No guiding needed.
Didn’t see where it was taken.
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Tim.Ellison 0.00
Tim Ellison
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And presumably the short exposures would mean that a quite (very?) rough and ready polar alignment would suffice. Although a decently solid mount and an ability to track the target reasonably well would still be important. Does it offer you anything to chew on Keith??
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maxchess 2.61
maxchess
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This guy was using a "Nauris Mirrage 600 mm f 3,8 Dobson"  this scope is not capable of accurate tracking so he was forced to use very short exposures to avoid star elongation / trails. Interestingly he used a Pegasus rotator to avoid field rotation. The total integration time for this image was 8 hours and the quality is relatively poor for this amount of time. There are clear photoshop halos round the main image.
See this image  
with the same camera using only 3 hours and in Bortle 8 skies.

Max
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