I remember reading about needing to "dial in" extra exposure compensation if the shutter time is over ~2 seconds (or was it 5? or 10?). So if the "correct" exposure would be 1/4" @ f/2, you would start by converting it to 8" @ f/11, but then adjust the aperture (or ISO) because of some weird effect of using a long shutter speed. I'm pretty sure it had nothing to do with the sensor heating up and causing noise.
I can't find the theory/directions anywhere, and maybe I was dreaming... but if anyone knows anything about this, please pitch in.
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