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Suggested settings ZWOASI071 for DSOs?

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9 replies to this topic

#1 AlexTardif

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Posted 21 May 2019 - 07:01 PM

Hi folks -

 

With the weather finally clearing up in a few weeks I'm looking forward to starting my imaging sessions in early June with ZWOASI071 paired to a wide field refractor, an 86mm f/5.4 Quad Astrograph.

 

I'm still a compete amateur with imaging and brand new to this particular camera, so looking for advice on sample settings for DSO objects.  My targets will likely be Elephant Trunk, North American, Swan, Eagle Nebulas.

 

Could someone please provide guidance with what I should be choosing in SGP when it comes to:

  • What gain to choose?
  • What temp?
  • How many subs?

Any other tips when using the above combo?

 

Thank you :)



#2 ZL4PLM

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Posted 21 May 2019 - 07:16 PM

Hi Alex 

 

https://www.astrobin.../full/404160/0/

 

https://www.astrobin.../full/402818/0/

 

have a look at these

 

taken at gain 0 - 5 min subs - @ -20c

 

depends how light polluted you are - you might want shorter subs if your plagued by LP 

 

I am in pretty dark skies here

 

Cheers

 

Simon 


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#3 mumbles

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Posted 21 May 2019 - 08:05 PM

M51 taken in a bortle 4.5 zone a combo of 3 and 5 min subs @f7 50 gain and -10c. https://astrob.in/402509/U/


Sent from my SM-G950U using Tapatalk

Edited by mumbles, 21 May 2019 - 08:06 PM.

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#4 jgraham

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Posted 21 May 2019 - 09:07 PM

My standard settings under my Bortle 8 skies include using a gain of 200, 240 second exposures, and a temperature that keeps the current draw on the TEC under 30% (usually 0C or 10C this time of year).
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#5 reddog1972

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Posted 22 May 2019 - 04:24 PM

I mainly image with the ASI071MC pro at a site which is almost SQM 21.  My settings are Unity Gain, 300s subs @ -20C....  I couldn't be happier with those settings for dark skies!
Leo triplet asi071
M33 asi071

Edited by reddog1972, 22 May 2019 - 10:04 PM.


#6 Lead_Weight

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Posted 22 May 2019 - 04:33 PM

I've been using 50 gain 12 offset. Cooling -10 since I'm in a hot area and is difficult to cool below that.

 

get.jpg?insecure

 

get.jpg?insecure



#7 stargzr66207

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Posted 22 May 2019 - 06:46 PM

Alex,
I use my ASI 071 set for Highest Dynamic Range (HDR), and cool it to -10.
Ron Abbott

#8 ezwheels

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Posted 22 May 2019 - 11:38 PM

 

I mainly image with the ASI071MC pro at a site which is almost SQM 21.  My settings are Unity Gain, 300s subs @ -20C....  I couldn't be happier with those settings for dark skies!

  

Adjacent issue I know, but your Leo triplet image kind of looks like you have the fogging issue I had on the sensor of my 071. 



#9 AhBok

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Posted 23 May 2019 - 07:44 AM

I use unity gain, 60-300 sec subs depending on object and sky conditions and -5c cooling. I find little, if any, improvement by cooling lower with this sensor. I have Bortle 5 skies.


Edited by AhBok, 23 May 2019 - 07:45 AM.


#10 cfosterstars

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Posted 23 May 2019 - 11:55 AM

I use a temperature of -5C or -10C when I can, but there is little gain in dark noise below about 0C. So if you can get to -5C you should be good. The dark current really flattens out on this camera. 

 

I have bortle class 5 skies also. For the ASI071MC-PRO, I use two gain settings: gain of 90 (similar to ISO800) and gain of 150 (similar to ISO1600) with exposure times of 10s, 30s, 60s, 90s, 120s, 150s, 180s, 240s,

300s and 600s. For all these combinations I created a dark library of between 60 to 20 exposures - less for the longer exposures for my darks. For each set of dark frames, I used PI to integrate the frames to generate DarkMaster frames. These frames are reused.

 

For various targets, I can show you some examples since I have an SV80ST2 which is a similar OTA to yours.

 

Here is my capture of the North American nebula and Pelican nebula this was with 60s subs:

 

https://www.astrobin...371825/?nc=user

 

This is the M8/M20 region with the same rig again with 60s subs:

 

https://www.astrobin...362742/?nc=user

 

This is M31, with 30s and 300s subs and 300s with a 12nm Ha filter.

 

https://www.astrobin...7835/C/?nc=user

 

I have a new dual NB filter for the OTA but I have not tried it out.




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