Dark Calibration frames

Image processing, astrometry, photometry, etc.
Post Reply
Dave_S
Posts: 16
Joined: 11 Oct 2021, 10:09

Dark Calibration frames

Post by Dave_S » 14 Oct 2021, 13:24

Having just returned to astro imaging after being out of hobby for 8 years, I am trying to pick up where I left off, and to remember the things that I have forgotten.

Back in the day, I used AA3, AA4, and lastly AA5 I have now upgraded to AA8.

Having moved on from any many years of using CCD cameras, I have now moved to using CMOS. I am told that accurate dark frame are very critical in removing the amp glow/starburst inherent in CMOS cameras, and am advised that a Master Dark Frame must be created from unscaled dark frames.

Can I stack dark frames while keeping then 'as is', unscaled in AA8.
Last edited by Dave_S on 14 Oct 2021, 17:33, edited 2 times in total.

Iver
Posts: 55
Joined: 08 Jan 2019, 04:32

Re: Dark Calibrarion frames

Post by Iver » 14 Oct 2021, 16:38

As long as the darks and lights have the same exposure time you will be fine. To scale you would need to take darks with a longer exposure then your lights and a bias frame. There is a separate section in preprocessing that handles dark scaling, just don't use that feature.
Iver

Dave_S
Posts: 16
Joined: 11 Oct 2021, 10:09

Re: Dark Calibration frames

Post by Dave_S » 14 Oct 2021, 17:33

Thanks Iver. "To be fore warned, is to be fore armed" :)

Post Reply