paolo speggiorin
Active member
Hi all PI enthusiast!
I have a doubt tha occured to my for the first time when I took an image of a detail of M31 galaxy with a Newton D=500 mm and Focal Lenght= 2.500 mm: although I used a full frame sensor (Sony Alpha7S), the focal lenght is so long that I had no dark sky on the background.
So I had to find a proper way to model the background:
- If I chose DBE, I didn't know where to put the key points because I had no constant level of background to choose...
- I tried with ABE process, both subtracting and dividing, and I had the results here attached
My question is: is ABE process the best way to model the background in this situations when there isn't enough dark sky on the background?
Any suggestion will be appreciated, thank you all!
(attached image shows, from the left: the result of image integration, ABE-divided, ABE-subtracted)
I have a doubt tha occured to my for the first time when I took an image of a detail of M31 galaxy with a Newton D=500 mm and Focal Lenght= 2.500 mm: although I used a full frame sensor (Sony Alpha7S), the focal lenght is so long that I had no dark sky on the background.
So I had to find a proper way to model the background:
- If I chose DBE, I didn't know where to put the key points because I had no constant level of background to choose...
- I tried with ABE process, both subtracting and dividing, and I had the results here attached
My question is: is ABE process the best way to model the background in this situations when there isn't enough dark sky on the background?
Any suggestion will be appreciated, thank you all!
(attached image shows, from the left: the result of image integration, ABE-divided, ABE-subtracted)