Ok heres the scenario...
Thought I would play around, I understand the correlation between exposure time and thermal noise, not knowing and being ignorant of the consequences of missmatched darks, and its cloudy, I did an experiment, as I said its cloudy so I cant use the darks anyway, Its more an experiment into where half a charge of battery dissapears to on a 350D,
Scenario.
Room held at 23.5 C, not using the scope so it doesnt matter.
Took a sequence of darks, with the 350 , 30 seconds each , spaced at 30 seconds, mirror settle turned off.
Stuffed a simple thermocouple up the tripod hole on the camera.
Camera temperature rose from 23.5 to 24.9 degrees, the exposure sequence has just finished and is as I type dropping in tenths very quickly... Now I ask, what is the procedure then for getting acurate darks, without regulation, and are these darks any use, does the cooldown period need to be a lot longer...
Your advice please , confused and runnig blind,
shawn