[Omaroo (Chris Malikoff)]

Being the consumer model, the 450D I'd assume will show amp glow - some worse than others. For 2 minutes, yours is pretty prevalent. I have a 350D and a Nikon D40 and neither generate appreciable amp glow until they've run 8-10 minutes. It isn't to be confused with thermally-induced CCD readout noise (which ICNR will remove most of) either - it's different. The higher end 40/50D 1D, etc, bodies turn the readout amplifiers (at the edge of the sensor) off during exposure, and only initialise them on read-out at the end of the exposure, so they don't suffer from it. You pays your money, you get better results, like with anything I guess. Whether the exposure your doing is a light or dark, I think that the amps are kept on regardless - so ICNR won't remove it. Can someone correct me here?

The best way to get rid of it is take a few dark frames with the same exposure details as your lights and get your stacking program to process them out in one hit.