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M20 23 min ASI294MCP 8SE CEM60

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#1 Gvs

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Posted 10 June 2018 - 01:01 PM

CEM60 with and ASI294MCP is a great combination, regardless of OTA.

 

Here is 23 min of M20 at 300 gain 30 seconds subs. Taken from George Observatory on Friday June 9th, 2018, through a Celestron 8SE with some collimation issues (the camera was not fully parallel to the scope optics).

 

SharpCap 3.1 image was processed through Gimp 2.10

Attached Thumbnails

  • M20 8SE 294MCP -10.jpg

Edited by Gvs, 10 June 2018 - 09:31 PM.

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#2 elmiko

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Posted 10 June 2018 - 01:27 PM

Nice picture. Especially with so little data! You must have some dark skies.



#3 Gvs

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Posted 10 June 2018 - 01:56 PM

It's the camera, we actually had clouds passing through and a lot of humidity.

What was interesting was that the camera was able to reach -14C though it was using 100% power. So we left it at -10C.

One detail, we did try 60s subs, though amp glow crept in. At 30s subs, this camera is amazing.

Edited by Gvs, 10 June 2018 - 03:05 PM.


#4 jgraham

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Posted 10 June 2018 - 02:15 PM

Very nice! I have been using 240 second exposures with my ASI294MC Pro with a gain of 200 and there is some amp glow, but darks do a excellent job removing it.

 

Nicely done!


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#5 Jeff2011

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Posted 11 June 2018 - 10:07 AM

I was fortunate to image with Gabe that night at The George Observatory.  I am an SGP imager but Gabe's techniques impressed me so much I bought the pro version of SharpCap to try it myself.  Will try it with my ASI1600MM-C first but plan on getting an ASI294MCP.  Not that I intend to stop using SGP as each has their use depending on the situation. Gabe's image is a live stack that has been post processed.   The line between EAA and imaging is disappearing.

 

 


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#6 DonBoy

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Posted 11 June 2018 - 11:18 AM

Nice image.  Would like to see more of these short exposure shots-

 

I do most of my imaging live on Nightskiesnetwork.com and I use the ASI294MCPro with SC and AT(AstroToaster) with settings of 20sec & 30sec at 390gain and typically run stacks for 10min, unless I get into a conversation and then who knows how long.   Darker skies would be a big help if I had them but happy that at least we're at Bortle 6.5.

 

ASI294 working album:

 

https://www.flickr.c...57692230746941 


Edited by DonBoy, 11 June 2018 - 11:19 AM.

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#7 Gvs

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Posted 11 June 2018 - 10:49 PM

These images would not have been possible without Jeff's collaboration.  My battery bank was dead, so he facilitated a Lithium bank to keep the dew of the telescope.

 

Thanks for all the advice and support as well as the comments.

 

Here is another photo taken that night.  This was a 30 min integration

  • M063 June 8th, 2018 21:49 CST
  • Sunflower Galaxy
  • NGC 5055
  • George Observatory, TX
  • SharpCap 3.1 (guiding by Sharpcap) / Gimp 2.10
  • 8SE / ASI294MC (-10C) / CEM60
  • 30 min @ 300 Gain
  • 60 - 30 sec subs

Attached Thumbnails

  • M063_8SE_294_-10_012330.jpg

Edited by Gvs, 11 June 2018 - 11:08 PM.

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#8 AhBok

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Posted 12 June 2018 - 04:37 PM

Gvs,

Could you share info on your calibration frames please? Are you using dark flats?

Randy

#9 MoonPrince

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Posted 12 June 2018 - 10:50 PM

Very nice!



#10 Gvs

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Posted 13 June 2018 - 12:43 AM

Gvs,

Could you share info on your calibration frames please? Are you using dark flats?

Randy

No dark flats.
  • Set the Color Space (Item 1 - Attachment A).
  • Register your camera with SharpCap using this process. (Item 2 - Attachment A),
  • Then take flats using using (Item 3 - Attachment B) and they are generally used as long as the camera is not removed from the OTA. Each time the camera is re-attached, a new set of flats is taken.
  • Next, darks before each session at the temperature that the camera will operate that night (item 4 - Attachment B).
  • Repeat steps 2 and 3 if you modify the color space (item 1 - Attachment A).
  • If you change the temperature (item 5 - Attachment A) repeat step 4 and use that file.
  • With the dark and flats, you can set your Pre-Processing for the session (item 6 - Attachment A)
  • SharpCap' s sky analysis (item 7 - Attachment A) is used to determine the optical Gain,
  • This defines your Gain and Time (Its best to have a logarithmic equation for this, each camera has one). Personally prefer to use less dynamic range and a bit more time than what the sensor analysis estimates, specially with low surface brightness objects.
  • Then wait a cycle for SharpCap to query the camera
  • Press the auto stretch (item 8 - Attachment A) in the histogram on the control panel.
  • Enable LiveStacking (item 9 - Attachment B)
  • Then do the auto setting (item 10 - Attachment B) on the large histogram,
  • Then press the auto set on the color balance (item 11 - Attachment B), this is good to see thing in EAA, though not good for post processing.
  • Finally tweak the small histogram to reduce the noise by moving the right vertical line towards the peak in the histogram (item 12 - Attachment A).
  • Do save your results in 16bit/32bit and optionally as viewed every 5 minutes (Item 13 - Attachment B)
  • To process the results use the 16bit or 32 bit results, these will already be calibrated images. (wish Robin would add an auto save every given time interval, it would save a lot of time).
Hope that helps.

Attached Thumbnails

  • Attachment A.jpg
  • Attachment B.jpg

Edited by Gvs, 13 June 2018 - 01:22 AM.

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#11 AhBok

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Posted 13 June 2018 - 09:06 AM

Thanks very much for this! You are getting some great results. Again, thanks so much for the time and generosity sharing this.


Edited by AhBok, 13 June 2018 - 09:09 AM.


#12 astrobobbo

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Posted 14 June 2018 - 11:55 AM

Hi, I really like the image you took of M20.I noted you processed it with Gimp.
Can you tell me wath is the command that you use to combine a Luminance Channel with the rgb data? I think in photoshop in luminosity.
Ciao thank you
Roberto

#13 Gvs

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Posted 16 June 2018 - 07:15 PM

The process is described in the documentation

 

Though never used it,  as I use OSC cameras. 




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