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Luka you can turn off the Liveview screen display, use the Disp button after you have framed and focused. Leaving the countdown timer on the display can lead to light leaks on long subs. Re ISO i was shooting narrowband at ISO1600 with the mono camera, which needed max sensitivity with the sensor cooled to max. Remember that the 450D sensor achieves optimal noise reduction once you get to 0C, there is not much to gain by pushing it down to -10C or lower. Rowland did some dark comparisons at various temperatures to come up with 0C target.
Craig Stark did some tests on various Canons and suggested ISO800 was the sweet spot in terms of SNR.
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