Thanks Ray,
you have given me plenty of ideas
Yeah after I wrote my last post I then thought that the mean would be the best way to go not sure how much the max histogram value would jump around indoors.
In my last post I wrote
>>Also, would it be better to have the same exposure and gain settings and adjust the light source distance so they have the same histogram value?
I think if it was done this way the only difference would be the noise value without having done this myself it seems like a good way for the SNR test.
For another signal test I thought about screwing different filters onto the camera's, such as red, green and blue while pointing it at a white light source. It would be interesting to compare the different channels particularly the blue because this wavelength struggles with signal on some of the planets and as a result a lower frame rate is used.
Thanks again Ray I like your real world testing.