|
Settings for ASI183MC?
Hi all,
I've had the rig out the last two nights figuring out the magics of a dedicated OSC camera and an EAF. It's been interesting!
I did a lot of reading on various forums and web sites and they all said that a gain of 120 was 'Unity' gain for the '183, and to avoid using a gain under 50 because you'll get terrible colour banding. Also to take dark frames as there is amp-glow.
When I stacked the first set of images, it was very vignetted - far worse than what I got with my DSLR. (Just realised I should have posted an image. Will do so tonight when I get home from work.)
Telescope: EvoStar 72ED + 0.85 flattener (357mm focal length)
Camera: ZWO ASI183MC-Pro
I have 55mm of backfocus between the flattener and the camera sensor, as per the ZWO instructions.
I took dark frames as well, as I read that the '183 needs them. Still struggling to get flats sorted out (both the light source and the camera settings to avoid over-exposing everything).
Camera settings:
Gain: 100
Temperature: 0 degrees C
Offset: 40 (Ekos default setting)
Exposure: 30 seconds
Environment:
Suburban Melbourne - Bortle 5/6
No moon
DSLR specs:
Nikon D7100 (6000x4000 pixels, 23.5x15.6mm sensor, 3.9um pixel size)
ASI183 specs:
5496x3672 pixels, 13.x8.8mm sensor, 2.4um pixel size
My questions are as follows:
1) What settings should I be using for the camera to avoid over-exposing all the subs?
2) How do I take bias frames? What are the recommended camera settings for taking flats?
3) Is there anything I can do to get rid of the vignetting? I had to crop the outer quarters off the image, and even then corners were still a lot darker than the centre.
4) How much different will my post-processing workflow be when compared to the DSLR? I am using SiriL to stack and do the base processing, then Affinity Photo for the 'beautification' steps.
Many thanks!
V
|