Reply To: Pixel Value and Exposure

Hello again!
I’m not sure if you have yet resolved things to your satisfaction. Many of the suggestions seem very complicated, especially given that a stated advantage of CCDs, when they first appeared, was their linearity.
Another way of looking at your “curve” is that the shorter exposures are too bright.
Could it be that the lens aperture diaphragm is sticking or slow to close down?
In suggesting this, I don’t actually know if you are using the lens wide open or set to a smaller aperture.
It could be worth just trying a different lens.
Good wishes,
Peter Lyon