I do it so in theory I have at least something to work with when a few cycles go through - the weather is so variable I've had very limited time for imaging.
Another reason is that I'm concerned about the dithering time when taking a lot of short images - as I mentioned previously. I know I need to dither to stop any potential fixed pattern noise appearing and with a large number of subs that could be an issue.
Tonight I'm going to put these tables to the test (for broadband) before the moon comes up. I think I'm in an orange zone, maybe red, but I think it's safe enough to start working off orange and go from there. I was using gain 75, but I'm either going to go to gain 0 or 200 - haven't decided yet.
I have to think about the narrowband values more because I wonder how much amp glow will affect things with such long exposures?