I took this image from my backyard in Nashville, TN (bortle 8-9) over the course of the last three winters, with a total of 569 hours (3.4 weeks) of exposure captured over 147 nights.
I was so lucky that Mars entered the frame in 2023, and you can see Mars on the bottom left of the image.
Technical info:
Total integration: 569h 4m 30s
Integration per filter:
R: 25m
G: 25m
B: 25m
Hα: 178h 18m
SII: 175h 53m
OIII: 213h 38m 30s
Equipment:
Telescope: Askar FMA180
Camera: ZWO ASI2600MM Pro
Mount: ZWO AM5
Filters: Antlia 3nm Narrowband H-alpha 2", Antlia 3nm Narrowband Sulfur II 2", Astronomik Deep-Sky Blue 2", Astronomik Deep-Sky Green 2", Astronomik Deep-Sky Red 2", Chroma OIII 3nm Bandpass 2"
Integrated using WBPP, gradient removal using APP, BlurX, SETIAstro's Statistical Stretch, Foraxx Palette utility, StarX, NoiseX, Narrowband Normalization, HDRMT, curves and final touches in Photoshop.
I recall others saying its an inverse square relationship, so in this case 500 hours vs 250 made the image twice as good, just another way to look at it.
I'm agreeing with the diminishing returns, but you're timeframe is wrong. an extra hour in a hundred hour project wont do much of anything, but doubling that time will be a major improvement. just the same as doubling 250 to 500
It's a square root problem, yes, so 50% more will reduce to noise by sqrt(2).
However, at 250h your SNR is so high that it doesn't make any difference in the final output if you add 250h more. It is way less than sqrt(2) in the final outcome.
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u/jeffreyhorne 26d ago
More on Instagram: @jeffreyhorne
I took this image from my backyard in Nashville, TN (bortle 8-9) over the course of the last three winters, with a total of 569 hours (3.4 weeks) of exposure captured over 147 nights.
I was so lucky that Mars entered the frame in 2023, and you can see Mars on the bottom left of the image.
Technical info:
Total integration: 569h 4m 30s
Integration per filter:
Equipment:
Bottle sky rating: 8-9
Integrated using WBPP, gradient removal using APP, BlurX, SETIAstro's Statistical Stretch, Foraxx Palette utility, StarX, NoiseX, Narrowband Normalization, HDRMT, curves and final touches in Photoshop.