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I am using NTC in the lrtimelapse screen. As I learned in a tutorial of Gunther a NTC of two will bring down the reference value during dusk to the half of the initial value ( I had a value of 132 using only a Region of the whole picture. I switched the NTC to 3.0 and started the Holy grail (sunset) with NTC. The new night reference value was then 88. After my calculation it should be a third of 132, that means 44 but NTC only subtracted 44. Am I wrong with my calculation? What can I do to bring the reference value much further down?

What was the NTC text saying?

What do you mean? on the 'button' is shown NTC 3.0

In the information LRTimelapse display (upper left corner of the image) there is a 'NTC:' line.

At first (I started the program an hour befor sunset) it showed the correct sunset time for my location, then it showed dusk an the end of dusk and finally it showed Night and -> 6.27 what means our actual time where the sun will be about 12 degrees under horizon tomorrow morning,the begin of the nautical twilight

at night it will be your ref value - ref value / ntc value (3.0 in your case) + delta value if any.
you can use a smaller number, like 1.5

That is what I thought, but it has not been the reference value /NTC Value, it has only been the reference value /1.5 even though I set the NTC to 3.0

I did just another test today with NTC 5.0 . I send some screenshots to visualize

In case of a higher NTC value (3,0 or 5,0 you used) the NTC reference will be closer to the original reference.
To have a smaller NTC reference you need to use a smaller NTC value like 1,5

Thanks, will try it this evening.
May you tell me how the mathematical relation between the reference value and the NTC to calculate the night reference value is?
kind regards wolfgang