M20 Trifid

You shouldn't be shooting with this camera and this filter at 0 gain. You need to set it to 210 or a bit higher, where the step is on the graph. With this filter, 5-minute exposures are fine; you won't overexpose.

Sep 27th, 2024

UrmasXReply to Oleg Novoselov

Possibly. The step is at 180 or 181, if the graphs are to be believed.
The object was low on the horizon. Conditions were so-so. The guide periodically lost stars, so I didn't risk 5-minute exposures.

Sep 27th, 2024

Oleg Novoselov

We go to the player's website, look at the graphs... We see that Gain 1 matches the HGG mode, and this gain is 210. Noise drops from 7.5 to 1. The full well capacity, of course, also drops to 4200, but the dynamic range hardly changes. Therefore, the advice is to shoot almost everything in this mode. Just if the object is very bright, use a shorter exposure. I would even shoot galaxies in this mode; the key here is to avoid overexposing the stars.

Sep 28th, 2024

UrmasXReply to Oleg Novoselov

So that's what it is.
The graphs from the seller and on the player websites don't match.
It's planned to shoot at a gain of 210. But what offset is needed? In ASIAIR, there simply isn't such a setting...

Sep 28th, 2024

Oleg NovoselovReply to UrmasX

Regarding offset calibration, close the optical scope and take the shortest exposure possible (enter 00 in NINA) and monitor the minimum values. If it continues to show 16, you are about to clip the dark areas; increase the offset until you see the "min" around 80-100 (or higher) and stabilizes at that level. Just keep taking offset frames and take more than a few to see if fewer than 16 pixels are clipped.

Sep 28th, 2024

Oleg NovoselovReply to UrmasX

Regarding offset calibration, close the optical scope and take the shortest exposure possible (enter 00 in NINA) and monitor the minimum values. If it continues to show 16, you are about to clip the dark areas; increase the offset until you see the "min" value around 80–100 (or higher) and stabilizes at that level. Just keep taking offset frames and take more than a few to see if fewer than 16 pixels are clipped.

Sep 28th, 2024

UrmasXReply to Oleg Novoselov

Do I need to perform this operation with the refrigerator turned on?

Sep 28th, 2024

Oleg NovoselovReply to UrmasX

So, at what temperature do you usually shoot?

Sep 28th, 2024

UrmasXReply to Oleg Novoselov

Thank you. I'll give it a try when the time comes.

Sep 28th, 2024