[RobF (Rob)]

Originally Posted by RickS

Best of all, it is quite simple to measure your subs to check if they are read noise limited or not:

http://www.iceinspace.com.au/forum/s...d.php?t=117010

Cheers,
Rick.

Many thanks for reposting about that thread Rick.
I was guilty of ignoring the first time around, and realise now just how helpful Ray's suggested TargetADU approach is!

Results in same ballpark as the Pixinsight SkyLimitedExposure script, but great rule of thumb to be working off to get a feel for any given sky conditions for a given OTA/camera combination.