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20th March 2020 - APP 1.078 has been released !

2019 November: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse, Astronomer in Charge of iTelescope.net

2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!

Andromeda...  

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(@suparnob)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 7
November 10, 2019 12:31  

My learning continues. This is Andromeda -- essentially my second astrophotograph. Taken from my backyard in DC (bortle 8/9). I need to do better at removing light pollution.

Taken with a William Optics Redcat and ZWO ASI294MC Pro OSC, Takahashi PM-1X mount. 15X4 minutes each.

2019 Andromeda 1 PI

 

This topic was modified 5 months ago by Vincent Groenewold - Moderator

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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1416
November 10, 2019 13:29  

That's fantastic for a second photo! Did you use any calibration files?


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(@suparnob)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 7
November 10, 2019 14:38  

Many thanks, Vincent! I did use some calibration files -- 30 each of bias, darks and flats. I suspect that my flats did not come out too well because when I stretch an individual flat (or the master flat), I do not see any gradation in the image, etc. I find it hard to believe that the scope has zero vignetting. I need to learn how to take proper flats. The darks, on the other hand, show an amp glow very clearly. 


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(@vincent-mod)
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Joined: 3 years ago
Posts: 1416
November 10, 2019 14:44  

Excellent, so when you think one of your calibration files is wrong, it's better to leave it out as it may have a bad influence on the endresult. Some more bias frames might also be helpful, as they're easy to make about a 100 is advised. But, really good start!


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(@suparnob)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 7
November 10, 2019 14:46  

Thanks! Great advice and good to know... I should reprocess the image without the flats and see if it makes a difference (and also, increase the number of bias frames).


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1416
November 10, 2019 14:53  

Yeah you will quickly see if it's better with or without, good luck!


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