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I use ISO1600 almost exclusively with my 1100D when at a dark site...after reading a bunch of threads on SGL (and elsewhere) about signal to noise performance, temperature, etc.
Beyond ISO1600 the red speckle with my 1100D is unbearable. At ISO1600 in cooler temps it's almost non-existent, whereas in summer temps, it's rears its head in subs beyond 2 minutes. In winter, somewhere between 5 and 8 minutes I was getting images that were over-saturated.
Maybe a light pollution filter is worth considering?
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