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Cost conscious AT80ED/asi294mc/L-pro/az-gti(eq) Misc EAA targets, Scottsdale B8+ 85% Moon

EAA Astro Tech Astrophotography DSO
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#1 Bob Campbell

Bob Campbell

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Posted 31 October 2023 - 12:44 PM

I was debugging an ASCOM/SW issue with the connection dropping between my synscan-pro win app and Sharpcap (4.1).

 

To study the issue, I needed to collect multiple targets with exposures > 10 min. After a while, sharpcap (or ASCOM) just loses the connection, and I have to reset sharpcap and synscan-pro (quite the pain)

 

I originally thought that with 85% moon, the results would be underwhelming, and just used for test data to sort out my problem.

 

It turns out that the combination of the Optolong L-pro filter (I use the cheaper 1.25” version screwed directly above the camera sensor) and the new sharpcap 4.1 live stack tools: histogram stretch parameter, gradient removal, color noise reduction, sharpening, flats and darks, reduce blowout of bright stars I was able to create pretty respectable images in far from ideal conditions.

 

One unexpected result of adding the L-pro filter to the AT80ED was elimination of probably 60% of the false color, a welcome side benefit.

The common features of each of these captures is the following:

 

12 sec sub, 250 gain, flats and darks. Histogram stretch parameter 5, gradient removal, color noise reduction, sharpening, and reduce blow out of bright stars. All live stack parameters, and available in pro version for 13 pounds per year. I did do a double flip in sharpcap to get more of a traditional object orientation.

 

Total exposure time was the only variable. Here are the regions and objects. I didn’t bother doing any crops.

 

To get the full benefit of the images, click on them, and that will bring you into the gallery. Then click on the filename on the right hand side and then choose under ‘options’ the Large size. That choice will show the most detail without going to an astrobin or some such site.

 

Frankly, I am amazed at the results.

 

Bubble 3600sec

Bubble  300frames 3600s WithAnnotations
 
C30 (lonely galaxy) 252sec
C30 galaxy 21frames 252s WithDisplayStretch
 
Cocoon Nebula 1392 sec (annotation)
Cocoon 116frames 1392s WithAnnotations WithAnnotations
 
Cocoon Nebula 1392 sec (better view of dark stuff)
Cocoon 116frames 1392s WithDisplayStretch
 
Crescent Nebula and surrounds 312 sec
Crescent 26frames 312s WithAnnotations WithAnnotations
 
Double Cluster 324 sec
DoubleCluster 27frames 324s WithAnnotations
 
M13 156sec (one can even see the propeller with a 80mm)
M13 13frames 156s WithAnnotations WithAnnotations
 
M27 Dumbbell 192sec
M27 16frames 192s WithDisplayStretch

 

 

M31 1284 sec

M31 Stack 107frames 1284s WithDisplayStretch
 
M31 1284, slightly post-processed with GIMP (free)
(link)
 
NGC7000 (N Am nebula) 636 sec
NAmNeb 53frames 636s WithDisplayStretch

 

 

 

Here is my setup and my light environment (just add the nearly full moon).

AT80ED setup

 

 

 

Bob


Edited by Bob Campbell, 31 October 2023 - 12:55 PM.

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#2 Jim in PA

Jim in PA

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Posted 31 October 2023 - 02:36 PM

Nice work, Bob!  I guess the L-Pro blocks a little around 430-440nm or so, sounds like it helps with gentle reduction of CA.


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#3 Bob Campbell

Bob Campbell

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Posted 31 October 2023 - 02:45 PM

Nice work, Bob!  I guess the L-Pro blocks a little around 430-440nm or so, sounds like it helps with gentle reduction of CA.

Thanks! I was surprised at the positive effect of the L-pro. The L-pro does allow some blue to come through in reflection nebulae and planetaries. For example, M45 nebulosity comes through, as well as the blue snowball.

 

Bob


Edited by Bob Campbell, 31 October 2023 - 03:47 PM.



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