Due to the increasingly long evenings and poor weather, I've not been able to try this out under the stars. On the night of 7th May 2005, after spending the night playing with the Artemis CCD camera, I performed a quick test with the SC3.
First some raw frames.
Amp On. 10s single raw frame.
Amp Off. Direct Bias Injection. 10s single raw frame.
Then I stacked 20 frames from each and strongly histogram stretched the result.
Amp On. 20x10s Histogram Stretched.
Amp Off. Direct Bias Injection. 20x10s Histogram Stretched.
Bear in mind that I'm sure some web browsers scale images - I suggest you save these an compare them locally on your computer.