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Well interestingly I have taken a few shots this evening - ranging from 90 - 240 seconds - M42, M46, Eta Carina and Omega Cluster - and taken a few darks, two interesting observations with noise reduction switched on.
1. Darks are nearly pitch black - I see no discernible noise whatsoever
2. The bulb shot for say 120 seconds, processes for maybe 120 seconds after the lens closes before the image is composited to the LCD / PC - maybe it is doing appropriately framed darks by popping up its prism, taking a dark, then subtracting it from the last image?
Pretty smart if it was!
PS
Had to add this time to DSLR Shutter to ensure a sequence isn't chopped allowing for post image processing by the camera.
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