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2023-01-19: APP 2.0.0-beta13 has been released !

!!! Big performance increase due to optimizations in integration !!!

and upgraded development platform to GraalVM 22.3 based on openJDK19

 

We are very close now to  releasing APP 2.0.0 stable with a complete printable manual...

 

Astro Pixel Processor Windows 64-bit

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(@hubert-hautecler)
White Dwarf Customer
Joined: 5 years ago
Posts: 18
Topic starter  
Posted by: @vincent-mod
Posted by: @hubert-hautecler

What do you suggest I do to get correct flats? Bias and darks are from last month.

That depends on how exactly you're taking them. What procedure do you follow exactly and what program do you use to capture it. How are you taking proper bias and darks..

 

I use Sharpcap for all my calibration files. I use for the flats a selfmade flatpanel with white chalkpaper. I take 30 flats of 2.5 seconds, my histogram is about in the half. Darks are taken at the same temperature as the lights (- 5°C) with a silicone cap (from Altair) on the camera. No light leaks. Bias the same way but I use the shortest integration time possible.


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(@vincent-mod)
Universe Admin
Joined: 6 years ago
Posts: 5218
 

Mmm, never seen such a flat panel. The most important thing there is that it creates a full-spectrum, flat field. Are you sure the panel delivers that? Besides that, some sensors have an issue producing a proper bias signal at the shortest amount of exposure time. I'd suggest a flatdark instead, where you do the same as for a bias, but expose for the time of your flat.


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(@hubert-hautecler)
White Dwarf Customer
Joined: 5 years ago
Posts: 18
Topic starter  

My flatpanel is like the one with the white T-shirts, only I don't use a T-shirt but white paper. 😊 

Next time I will take a shorter time for my flats so that the histogram is more to the left at 2/3 of the histogtam. Maybe my exposure was to high although it was just in the middle, somewhat to the right side. 

And take flat frames instead of bias.


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(@vincent-mod)
Universe Admin
Joined: 6 years ago
Posts: 5218
 

I think your time is fine, it's usually even better to expose for longer, just making sure not to clip on the right-hand side. Reason for this is that you use the full dynamic range of the sensor which can actually help in cases of quite big vignetting.

 


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(@vincent-mod)
Universe Admin
Joined: 6 years ago
Posts: 5218
 

ps. I tried to make an artificial flat as well, but I keep having an uneven pattern in the end result. This signals to something creating something that's not a regular gradient. This could be light pollution or a light "shining" into the optics, could this be the case?


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(@hubert-hautecler)
White Dwarf Customer
Joined: 5 years ago
Posts: 18
Topic starter  
Posted by: @vincent-mod

ps. I tried to make an artificial flat as well, but I keep having an uneven pattern in the end result. This signals to something creating something that's not a regular gradient. This could be light pollution or a light "shining" into the optics, could this be the case?

Maybe light pollution because the nearly full moon was up. A light shining in the optics seems not possible because my setup is shielded by gardenpanels. 


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