Graham. I am using an Astronomik CLS-CCD filter on an unmodded 1000D. Astronomik claim that its performance is very good on both modded and unmodded cameras in suburban light areas/moon glow etc. Have a look at the Astronomik site and read up on the technical specs. Having said that, the prime purpose for buying the CLS-CCD was to take colour shots.
Here is an example - keep in mind the newbie short comimgs.
Hope this is helpful.
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