Sorry guys - Photography 101 here! Please be patient with me.
So I have previously used ICNR with the Pentax K100D but the time it takes is too much for timelapse - particularly for meteors whizzing by! I want to maximise shutter open time!
So I experimented last night with INCR off.
Here is a 20 sec dark (cap over lens in a dark room), ISO 1600, camera temperature probably 22-25 deg C. White balance set to "Tungsten". And saving as jpegs on the memory card.
I've had to resize and compress but is this what I expect to see - a rainbow of colours, something like the early quantum fluctuations of the Universe?