Quote:
Originally Posted by Dave882
Martin that's a more than respectable contribution! The overall structure is well resolved, and it's just the fine detail and those dimmer regions that is effected by the lp noise. But yes, without consecutive clear nights over a new moon you can't hope for much better from the suburbs. The last month or 2 has been really dismal, and even when the sky clears its only for a few hours, and the jet stream...yeah don't get me started....
I've resolved to the fact that unless I can capture around 30hrs from my location it'll be a bit sub-par...but then again, you can only work with what you've got!
Keep up the great work mate!
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Thanks Dave,
Appreciate your positive feedback
I guess I’m forgetting that I’m imaging a mag 10 dim Galaxy with an angular size of 11 x 6 arc mins under B8 skies with neighbours backyard floodlights on until midnight and only a 8” aperture at 1000mm focal length. Then throw atmosphere seeing into the equation plus Sydney’s central CBD light dome to the North causing a huge bias in the gradient snowstorm , so it ain’t too bad for only 10 hours I suppose.
I imaged M20 Trifid in LRGBHa during a new moon winter with 30 sec subs ( 8 hrs of LRGB and 2hrs of Ha ) and the gradient was manageable and easy to mitigate. The image turned out to be one of my best M20’s in years. Admittedly M20 is a mag 6 object with a dense Star field and loads of Ha so a huge difference in size and brightness from that of tiny dim NGC1365.
These ZWO 2600 series cameras are so damn sensitive , they gobble up photons but also LP gradients as well.
Still thinking about that Antlia Triband LRGB broadband filter as a substitute for Luminance ( only for use in Sydney of course)
Thanks again
Cheers
Martin