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31 July 2020 - Comet Registration video tutorial using APP 1.083-beta1 released.

30 July 2020 - APP 1.083-beta1 has been released introducing Comet processing! This 1st beta has comet registration. The stable release will also include special comet integration modes.

9 July 2020 - New and updated video tutorial using APP 1.081: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse (iTelescope.net) and Mabula Haverkamp

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

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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 12, 2020 16:28  

So I have been navigating my ways and trying to learn APP to a viable/better option to DSS.  When going through the stacking process I got this message.  I mentioned this in a previous post and am not grasping it.  Flats were taken to get around 50% of full ADU value.  Input is appreciated. 

APP flat message
This topic was modified 1 month ago by Phil Miholovich

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(@wvreeven)
Neutron Star Customer
Joined: 2 years ago
Posts: 213
July 12, 2020 23:51  

Can you either place a link to your other post, or tell here which calibration frames you are using exactly? Flat, dark, dark flat, bias? Which iso/gain for each?


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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 14, 2020 02:58  

Sorry about that.  I am using Lights, Darks, Bias and Flats.  All taken at ISO 200 (Nikon D5300) Lights and Darks are the same time frame. Bias typically come out around 50ms and flats at around 125 ms based on my current setup.


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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 14, 2020 03:07  

Also out of curiosity I opened up the flat for viewing and notice that the blue and green are far right and red is quite a ways to the left.  I thought I saw a video describing this and how to check but am not seeing this. 


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2128
July 17, 2020 21:25  

Mmm, so the warning does relate specifically to the Bias. For some reason the readout of this ISO/gain value is different. Are you sure you selected them to use the same ISO/gain and used the same software for taking these data frames?


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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 18, 2020 01:16  

Hmm, I see what you mean now.  I went back and checked and APP shows -.99998 for master bias and darks on both sessions.  I pulled a handful of the  ASIAIR fits files for each and they are all at ISO 200.  To be clear I stacked 2 sessions with lights, darks and bias's for each session and grabbed a set of flats and selected use the flats for both sessions.  Interesting enough, the flats show the correct ISO.  I did load everything and processed everything at once going through each step of APP  I am using a dslr and am wondering if I should be following the tutorial Mabula demonstrates in which he makes all the masters individually.  I also have a fresh set of data from the Trifid that I can run and see how it goes.  Also wondering if I have error'd related to the multiple sessions although it is pretty straight forward.    


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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 18, 2020 01:58  

So I went and tried to create a master dark.  Each frame shows an ISO of -1.  Very strange.  i have included snips of top and bottom screens in APP and notedpad information on from ASIAIR fits file

ASIAIR fits information
APP Dark Test II
APP Dark Test

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(@pscm)
Brown Dwarf Customer
Joined: 1 month ago
Posts: 8
July 18, 2020 02:15  

I just loaded some different darks and all seemed well.  I have a theory but not sure how to prove it.  In this event that was creating the odd ISO number;  in the ASIAIR one performs an auto sequence command in which you enter in exposure time, number of images and the type of image, i.e. lights, darks, flats, etc. 

With this particular data set i didn't change the image type and left all of them as lights. Not sure if this does anything strange to fits file so that it is not liked by APP.


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2128
July 19, 2020 09:29  

I don’t know what the ASI air is doing in that regard, but I’m suspecting the header information is somehow wrong or absent when it is writing these frames. You can compare the headers by loading in a light with correct gain and looking at the data left to the main view window. Then load in the other and see what the headers state there.


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