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M2 – Globular Cluster in Aquarius – ZWO ASI294MC Pro @ f/10

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#1 jgraham

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Posted 17 August 2019 - 09:20 AM

Telescope: 10” Meade LX80 at f/10, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, -10C; Gain: 200
Filter: Orion Imaging Skyglow Filter
Guide scope: ETX-60, Meade DSI Pro III, PHD
Exposure: 28x120sec saved as FITS
Darks: 32x120sec saved as FITS
Flats: 32x30sec, LED tracing tablet covered with 3 layers of muslin
Average Light Pollution: Red zone, fair transparency
Lensed Sky Quality Meter: 18.6 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop

 

M2 (8-2-2019)-2j.jpg

 

I had this scope set up earlier in the evening for imaging Jupiter at f/25, so I brought it back to f/10 for a couple of test images. The image is a tad soft as I forgot to reset PHD to go easy with the guiding and it tended to over-correct a bit.  Imaging at f/10 is a bit of an acquired taste, but it can work well when the seeing supports it.

 


  • PirateMike, artem2, pgs/sdg and 1 other like this

#2 petert913

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Posted 17 August 2019 - 10:06 AM

Wonderful capture !!



#3 stargazer60

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Posted 17 August 2019 - 10:19 AM

Beautiful image! It reminds me of the simpler times as a 12 year old boy discovering the night sky for the first time.  In fact M13 was the first object I was able to find in my small Jason Empire 60mm refractor back in 1966.  I know this is M2 but it is still brings back memories because it is a globular cluster. Thank you for bringing back such fond memories of simple happier times.  Keep up the great work. bow.gif waytogo.gif 



#4 nimitz69

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Posted 17 August 2019 - 11:29 AM

Nice image.  Why 200 gain with 120 sec subs?



#5 jgraham

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Posted 17 August 2019 - 01:26 PM

With my ASI294MC Pro I always use a gain of 200 unless I have a reason not to. I have a complete darks library set up with a gain of 200, and only a partial set at 120 and 300.

 

I used an exposure of 120 second subs to stay away from saturating any stars in the cluster and to be sure to get a decent rate of successful subs.

 

It has been a while since I have done deepsky imaging with this scope and I forgot to go easy on the guiding.

 

Ugh.




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