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ZWO 183 MC Pro question

astropilch
09 Oct, 2019 19:08
Hello

I`ve recently acquired a ZWO 183 MC Pro. I image under Bortle 6 skies, not great but certainly useable. I`m also using the Skytech L Pro filter. I`ve yet to use it but i`m wondering if anyone else is using the same camera?
I have a Samyang 135 mm f 2 ED UC lens / A TS 65 Quad / Borg 60 ED f4.1 astrograph. Does anyone care to share there settings? Gain / Offset?

Clear skies
Alan
Edited 09 Oct, 2019 19:09
Farrell56
10 Oct, 2019 00:14
Hello Alan

I smile Have the same camera, Captured NGC7380 on Monday. Just remember to get Darks, Flats, and Bias before Processing or a not to good picture you will have..

Good Luck and Clear Skies
Farrell
bennyc
10 Oct, 2019 10:16
Hey Alan,

I have the monochrome version of the same camera for a while now. When it comes to settings, there's 2 things you need to be aware of:
  • banding artifacts at low gain
  • amp glow at medium-high gain
Most of the time I use unity gain (111) with default offset. Half unity (54) and double unity (178 )  and anything in between work fine too, but above that you lose too much dynamic range for DSO work and the amp glow becomes difficult to manage quickly, below that the banding becomes a problem (I had to throw away a night's worth of data because I accidentally set gain to 0, and it was just too horrible to fix up in post)

finally, because of the amp glow is very nonlinear, do NOT scale/optimize your darks. That includes calibrating your flats with bias and scaled versions of the masterdark. Instead capture dark flats, you don't need bias anymore then (note: this is generic advice for most cameras with strong glow, I use the same process for my ASI294MC).

references: https://www.cloudynights.com/topic/616524-sub-exposure-tables-for-the-zwo-asi183mm-and-qhy183m-and-colour-versions/
Edited 10 Oct, 2019 10:17
kingjamez
18 Oct, 2019 19:35
I've got both the color and monochrome versions of the ASI183. I use 111 gain, offset 10 exclusively on both cameras. This is a good camera for short focal lengths.
MikeF29
18 Oct, 2019 22:47
I agree with Jim and Benny. In my case I have learned that shorter exposures really make a difference as it is easy to oversaturate those small pixel wells. I do not process with bias frames and use unity gain and the default offset, I believe it is 10. Really does work well with short focal lengths. I did some work at -0- gain one time with unusable results. Terrible banding.

good luck and Clear Skies!
MikeF29
18 Oct, 2019 22:47
I agree with Jim and Benny. In my case I have learned that shorter exposures really make a difference as it is easy to oversaturate those small pixel wells. I do not process with bias frames and use unity gain and the default offset, I believe it is 10. Really does work well with short focal lengths. I did some work at -0- gain one time with unusable results. Terrible banding.

good luck and Clear Skies!
astropilch
19 Oct, 2019 14:10
Hello
Thanks for the replies. I've taken various darks varying between 30 secs and 240 secs all at 111 gain and default offset.
I'm still yet to actually use the camera. Fingers crossed for some time this week….

Clear skies
Alan
StevenP
19 Oct, 2019 15:00
Micheal,

  I have the same camera when you say short exposures how many and how long are we talking. I’m using the default 10 setting and 10 min exposure and have a lot of amp glow. Fortunately it all came clean with calibration.

Clear skies!
astropilch
19 Oct, 2019 23:49
Do you have any pics to show? I've yet to actually take an image 😡
StevenP
20 Oct, 2019 03:50
Alan

no not yet just got it.

smile
bennyc
20 Oct, 2019 08:12
Alan, as an example here's my M101 and M51:

https://www.astrobin.com/399868/
https://www.astrobin.com/398529/

I used 120s exposures back then.
 
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