Smart Histogram Optimal black level with ASIAIR

[Gus_Astro]

I'm an ASIAIR PLus user but before starting my session I would like to use the Smart Histogram to determine the optimal exposure time.
The problem is that the result gives an Optimal black level (last time I did a calculation was 4) but in the ASIAIR Plus you cannot adjust the black level.
What should I do?

[admin]

Hi,

ZWO tend to call it brightness rather than black level, so if that is present in ASIAIR then you should adjust that.

If it's not available then I guess the only option is to not worry about it. It's possible that ZWO removed the adjustment of that control to try to keep things simple - they might set a default value that is high enough to avoid black level clipping, which would work for almost any combination of settings. You could argue that doing this removes the risk of it either being set too low, or being set to different values for light and dark frames - both of which would give problems in processing. The advantage of setting it 'just right' compared to a global setting is fairly minimal.

cheers,

Robin

[Gus_Astro]

Thank you Robin.