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Hey Luka,
I'm running anything from 30 to 120 seconds @ ISO 1600 on my Lunt at F7 for best results. I aim to get the histogram 1/3 of the way across from left in BYE, the first line on the screen I think.
Actual time will depend which part of the sky and the sky condition.
East over the CBD is the 30 sec normally but west towards the hills can get me up to 120 secs. Cloud, haze, seeing, turbulence dependent of course.
If the noise is too much at longer exposures take more shorter subs is the answer.
My first positioning frame is about 10 secs to see if I'm on target, then correct framing and time and upscale appropriately. BYE is good for that. Every night is a little different.
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