Linear range of pixel values

Hello everyone! I use my D750 for astrophotography and love it but most people on the astronomy forums use Canon cameras (not everyone, Nikon is getting more popular!). So I'm hoping you guys can help me out with some technical information about my camera. For astrophotography images, I need to take "flats". To properly take these images I need to find the maximum pixel value in the linear range of the sensor. I know this criteria is applicable to CCD does this make sense for CMOS? And if so what is this value for my D750? For most CCD cameras this value is between 20k - 25k. I appreciate any help!

Welcome aboard. Enjoy the ride.

I don't do much astrophotography, but I am sure another member that can help you out will be along.

Do you want this information to get properly exposed flats? Or do you need to know the exact number because your stacking software asks for it?

If your flats supposed to be a unified field just over half of the maximum pixel value, then it seems like you could use the histogram on your camera to know when you've hit the maximum and also to see if you have a good flat at around 51%. That wouldn't tell you the number, but it would get you the flat you need. (Not trying to start a war about whether histograms are linear...)

This may be helpful:
https://photographylife.com/astrophotography-tutorial/

Thanks blade canyon. I want the value to ensure my flats are properly exposed. I've tried twice but the pixel values varied. I suspect that my field was not flat so I was hoping to get a value for a starting point.

Thanks for the link! I'm reading it now.