The key thing is to be sure you have a linear one, unless you use a DSLR.
Good sources of one are PixInsight (of course <smile>) and IRIS, which requires some fiddling with the scales.
There'll be an obvious skyfog peak. Assuming you can convert ADU to electrons, a good way to limit clipping is this.
Convert the skyfog peak to electrons. Subtract the ADU of a bias (or dark flat, doesn't matter).
Calculate your read noise squared. (it will be in electrons squared, ignore that).
Keep the first number in the range of 5-10 times the second, and the amount of clipping will be reasonable.
Edited by bobzeq25, 28 February 2020 - 04:22 PM.