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Old 15-12-2015, 09:01 PM
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Join Date: Jan 2012
Location: Melbourne
Posts: 2,852
Originally Posted by ericwbenson View Post
Hi Allan,
Out of curiosity have you by chance calculated your "optimum" subexposure length (e.g. using the online calculators)? One would think that at ~1.1"/pixel unbinned your sampling would be fine for most locations.

Hi Eric,
No - I don't use those calculators.
I just try it out & see what happens.

Obviously in this case I tried a 600 second exposure at 1x1
& it didn't show the galaxy arms.
A 600s 2x2 exposure showed a fair bit more
so then I did a 900 second 2x2 exposure where I started to see the galaxy arms
so I took 6 luminance frames in the limited time before the clouds came over.
NGC 300 is a difficult target from a light polluted location.
I could probably do 2 minute exposures on Orion & get even the faintest detail.
BTW - I use a 2" Astronomic CLS-CCD filter in front of all other filters
owing to the sodium lights all down the street where I live.

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