Dark Scaling with D...
 
Share:
Notifications
Clear all

19 June 2021: Our upload server https://upload.astropixelprocessor.com/ has been migrated successfully to our new office with higher upload and download speeds (nearly 10MByte/sec up/down ) ! We now have 1 general upload user called: upload with password: upload. The users upload1 - upload5 have been disabled.

31 May 2021: APP 1.083-beta2 has been released ! APP 1.083 stable will follow soon afterwards. It includes a completely new Star Reducer Tool, New File Saver Module, Improved Comet registration and much more, check the release notes here!

DOWNLOADS are available HERE!

 

Dark Scaling with DSLR - temperature differences  

  RSS

(@astrozatwarniccy)
Hydrogen Atom Customer
Joined: 6 months ago
Posts: 2
May 23, 2021 15:37  

Hello,

I usually use QHY168C (it is cooled camera so I have never minded dark scaling), but recently I have started building new portable kit with Sony Alpha 5000. I think taking darks every night would be a massive pain, so I am interested in dark scaling, but I don't understand one think - how it deales with different temperatures? I read all exif data of sony raw file and I didn't find any temperature value. Therefore I would apprecieate information how excatly dark scaling works.

 

Best Regards

This topic was modified 2 months ago 4 times by Astrozatwarniccy

ReplyQuote
(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3550
May 23, 2021 17:36  

It is not required to take darks every session, just do it maybe once or twice a year for a cooled camera (and make one with say 80 or so). Also, a Bad Pixel Map is good to use always as that will work for that sensor at all times. Scaling is not advised, it can be done when the signal is linear, but if there is any other issue like amp-glow, it doesn't scale properly. With a non-cooled camera, I typically make a dark library of a few different temperatures. Since that is quite tricky, I just make a good one every season. When your sensor changes with say 5 oC (or the outside temperature), that would be a nice boundary to decide when to make new ones. It isn't ideal, but that is exactly why cooled camera's were invented.


ReplyQuote
(@astrozatwarniccy)
Hydrogen Atom Customer
Joined: 6 months ago
Posts: 2
May 24, 2021 22:43  

Thanks! I think I will do so - with about 3 different exposure times every 5 degree.


ReplyQuote
Share: