ASI2600 - Darks vs no darks

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XCalRocketMan United States of America
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ASI2600 - Darks vs no darks

#1

Post by XCalRocketMan »


Still working on my M110 contest with only eight more to go. I imaged M98 earlier this week but all the Lum subs were ruined (clouds moved in) and there were only 20x60 sec RGB subs available. So I decided to run a little experiment. I knew the ASI2600mm had very little inherent noise, so I processed the set of RGB subs once with dark calibration frames and once without. The results indeed show the low noise in the ASI2600. Details are on my blog at: Darks vs No Darks
Scopes Celestron EdgeHD-11; William Optics GT102; William Optics ZS61; Criterion Dynamax-8 SCT
Mounts AP1100GTO mount w/APCCpro; iOptron iEQ30 Pro; Criterion Dynamax-8 SCT
Lenses Hyperstar-III; Celestron 0.7x FR; WO Flat/Reducer 0.8x
Guiding Celestron OAG w/ASI174mm mini; WO 50mm; Orion ST80
Cameras and Filters ZWO2600mm Pro w/Optolong 3nm NB and RGB; ZWOASI1600mm Pro (ZWO LRGB and Astrodon Ha-5nm, Oiii-3nm, Sii-5nm), QHY10, Canon 50D; ASI174mm mini; ASI462MC; ASI120MC
Misc Moonlite focuser on Edge - Feather-Touch focuser on GT102; ZWO EAF on ZS61; ZWO 2" and 31mm FWs; Kendrick Dew System, Temp-est Fans
Software NINA; PHD; APT; BYE; PI; APP; PSP; Registax; FireCapture; SharpCap
Blog at: SkyAndRockets
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STEVE333 United States of America
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Re: ASI2600 - Darks vs no darks

#2

Post by STEVE333 »


Thanks for sharing your test results. Seeing the results is always better than just hearing someone's opinion, at least it is for me. Have fun with your nice new camera.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera: ASI 1600MM Pro + EFW Filter Wheel + Chroma 3nm Siii, Ha, Oiii + ZWO LRGB Filters
Software: PHD2; APT; PixInsight ***** My AP website: www.steveking.pictures
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UkDave Great Britain
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Re: ASI2600 - Darks vs no darks

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Post by UkDave »


Have you tried dithering between subs taking only flats and dark flats , no darks and compare to an image with darks taken, I just acquired a zwo533mc and will be trying this route .

Regards Dave
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XCalRocketMan United States of America
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Re: ASI2600 - Darks vs no darks

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Post by XCalRocketMan »


UkDave wrote: Sun Jul 11, 2021 7:29 am Have you tried dithering between subs taking only flats and dark flats , no darks and compare to an image with darks taken, I just acquired a zwo533mc and will be trying this route .

Regards Dave
Interesting idea. I might try and do that.
Scopes Celestron EdgeHD-11; William Optics GT102; William Optics ZS61; Criterion Dynamax-8 SCT
Mounts AP1100GTO mount w/APCCpro; iOptron iEQ30 Pro; Criterion Dynamax-8 SCT
Lenses Hyperstar-III; Celestron 0.7x FR; WO Flat/Reducer 0.8x
Guiding Celestron OAG w/ASI174mm mini; WO 50mm; Orion ST80
Cameras and Filters ZWO2600mm Pro w/Optolong 3nm NB and RGB; ZWOASI1600mm Pro (ZWO LRGB and Astrodon Ha-5nm, Oiii-3nm, Sii-5nm), QHY10, Canon 50D; ASI174mm mini; ASI462MC; ASI120MC
Misc Moonlite focuser on Edge - Feather-Touch focuser on GT102; ZWO EAF on ZS61; ZWO 2" and 31mm FWs; Kendrick Dew System, Temp-est Fans
Software NINA; PHD; APT; BYE; PI; APP; PSP; Registax; FireCapture; SharpCap
Blog at: SkyAndRockets
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sdbodin United States of America
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Re: ASI2600 - Darks vs no darks

#5

Post by sdbodin »


Good to see that someone else is experimenting with no darks. I did all my spring snapshots this way. Sure is quicker and with less unexpected results.

Steve,

P.S. I ditched flats too, but that has more to do with your specific optical thru-put that a camera noise issue.
Scopes; Meade 16 LX200, AT80LE, plus bunch just sitting around gathering dust
Cameras; Atik 460ex mono, Zwo ASI1600MC-cool, QHY5L-II color and mono
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Re: ASI2600 - Darks vs no darks

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Post by UkDave »


I dithered with a Dslr which help , regards flats they’re a must IMO .
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XCalRocketMan United States of America
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Re: ASI2600 - Darks vs no darks

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Post by XCalRocketMan »


sdbodin wrote: Sun Jul 11, 2021 6:19 pm Good to see that someone else is experimenting with no darks. I did all my spring snapshots this way. Sure is quicker and with less unexpected results.

Steve,

P.S. I ditched flats too, but that has more to do with your specific optical thru-put that a camera noise issue.
Flats are a must in my situation as my optical path produces a fairly substantial vignetting. And, those dust motes on your filters will get you every time. The one time I didn't take flats on a wide field nebula was the time I spend hours removing the dust donut manually with graphic editing tools.
Scopes Celestron EdgeHD-11; William Optics GT102; William Optics ZS61; Criterion Dynamax-8 SCT
Mounts AP1100GTO mount w/APCCpro; iOptron iEQ30 Pro; Criterion Dynamax-8 SCT
Lenses Hyperstar-III; Celestron 0.7x FR; WO Flat/Reducer 0.8x
Guiding Celestron OAG w/ASI174mm mini; WO 50mm; Orion ST80
Cameras and Filters ZWO2600mm Pro w/Optolong 3nm NB and RGB; ZWOASI1600mm Pro (ZWO LRGB and Astrodon Ha-5nm, Oiii-3nm, Sii-5nm), QHY10, Canon 50D; ASI174mm mini; ASI462MC; ASI120MC
Misc Moonlite focuser on Edge - Feather-Touch focuser on GT102; ZWO EAF on ZS61; ZWO 2" and 31mm FWs; Kendrick Dew System, Temp-est Fans
Software NINA; PHD; APT; BYE; PI; APP; PSP; Registax; FireCapture; SharpCap
Blog at: SkyAndRockets
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sdbodin United States of America
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Re: ASI2600 - Darks vs no darks

#8

Post by sdbodin »


XCalRocketMan wrote: Mon Jul 12, 2021 2:06 am

Flats are a must in my situation as my optical path produces a fairly substantial vignetting. And, those dust motes on your filters will get you every time. The one time I didn't take flats on a wide field nebula was the time I spend hours removing the dust donut manually with graphic editing tools.
Yes, vignetting was what I was getting at. That brings up the problem of too big a chip for your scope, all that 'megapixel, full frame hype' that the newbie falls for:

Flats won't fix this!!!
Orion_28mmf28.jpg
Dust motes are a problem for anyone who is imaging in the 'outback' while on a trip etc.. Luckily I have little dust problems being sheltered and, maybe, too anal about cleanliness.

Good thread, much to discuss on this subject,
Steve
Scopes; Meade 16 LX200, AT80LE, plus bunch just sitting around gathering dust
Cameras; Atik 460ex mono, Zwo ASI1600MC-cool, QHY5L-II color and mono
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Graeme1858 Great Britain
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Re: ASI2600 - Darks vs no darks

#9

Post by Graeme1858 »


I always use some Dark frames to remove my ASI294 amp glow.

Capture.JPG

Regards

Graeme
______________________________________________
Celestron 9.25 f10 SCT, f6.3FR, CGX mount.
ASI1600MM Pro, ASI294MC Pro, ASI224MC
ZWO EFW, ZWO OAG, ASI220MM Mini.
APM 11x70 ED APO Binoculars.

https://www.averywayobservatory.co.uk/
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