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So many firsts...

astrophotography beginner CMOS
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#1 khursh

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Posted 23 May 2020 - 06:13 PM

While this is not strictly my first attempt at imaging, it is definitely my first attempt at doing it 'the hard way'. I have been doing EAA, and live stacking images in SharpCap. Honestly, the images come out pretty nice considering all the processing is done on the fly. I could subtract dark and flat frames (with bias) as it live stacked. A little noise reduction as it stacked as well as histogram stretch and voila. 

 

BUT, I decided I wanted to take the plunge and learn SGPro because I want to sleep. We are heading toward summer and even at my modest latitude of 38 and a half degrees, the skies aren't dark until 10. I'm old and need my sleep. I bought and learned SGPro with OSC over the last couple of days. I got it working and even did a meridian flip. I watched it, because I am the nervous type. As soon as I saw it happen, I was satisfied and went to sleep. I awoke the next morning to a (not quite complete) stack of images. The last image was foggy, so I guess I got some dew and SGPro shut it down because PHD2 couldn't find a guide star. I managed a little over 2 out of the 3 hours I 'scheduled'.

 

THEN, I had to take a crash course in processing. I stacked in DSS which is very straightforward, and then processed a little in GIMP. There is a ton of noise because its only 1.5 hours of useable frames. I will try to add a few more hours tonight. I did do a master dark and flat, but the flat is definitely no bueno because I got weird corners. I cropped them out.

 

https://astrob.in/0u4hry/0/

 

Just for giggles, I am also including a SharpCap version:

Stack 34frames 2040s WithDisplayStretch

60s subs x 34 for a total of 34 minutes


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#2 WadeH237

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Posted 23 May 2020 - 06:24 PM

This is outstanding for so many firsts.  Nice!


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#3 khursh

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Posted 23 May 2020 - 07:46 PM

Thanks Wade. I stand on the shoulders of giants including yourself. 



#4 bobzeq25

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Posted 24 May 2020 - 12:04 AM

A fine start.

 

Flats won't work well unless you also do either bias or flat darks.  Math.



#5 khursh

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Posted 24 May 2020 - 05:43 PM

More everything.

More data: 5.6 hours.

More calibration frames - lights, darks, flats, bias, dark flats.

A little more processing in GIMP again...

and

 

get.jpg?insecure

 

By the way, 

Orion EON 120mm @f/6 with Orion reducer/corrector

IOptron CEM60

ASI533MC Pro @ -5C

 

120s x 169 frames = 5.6 hours. (Stacked best 80% so more like 4.5 hours?)


Edited by khursh, 24 May 2020 - 05:47 PM.



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