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I don’t focus with the filter.... that L -Extreme cuts out a LOT of light which would mean super long subs to try and focus with.
I focus, tighten the lock once dialled in. Add the filter and then start shooting.
To quicken the process, you can focus on a distant object during day time (something far away... clouds, the moon, distant houses etc) and that will shorten the time to focus later at night
If your scope has markings for focus, use that. Otherwise do what I do and put a bit of tape on the focus barrel and mark the line for perfect focus. That means next time you can come back and be dialled right on. You might need a bit of tweaking but it will be very quick
As for gain, just stick to Gain 100 offset 50 for now. Gain 100 gives you lower full well but less noise (sounds counterintuitive but it’s true). Offset just means you won’t clip your blacks (it applies a gain value to your base so you always expose SOMETHING)
You can tweak it as you become more familiar with the camera
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