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Thanks for the crop. As Tony said keep the info coming.
As you say the camera would be a lot better without the filter! Like all all standard DLSR images there is an overwhelming blue/green sensitivity.
Regarding noise reduction, if you look closely at the crop you can see dark 'pitts' in the background. I have seen this effect when the dark frame is made at a warmer temperature than the light (it happens in Canons too). The dark frame overcompensates slightly and it is most noticeable if the camera is first switched on from cold. As you can tell I am not big on incamera NR in astrophotography (but it has its merits, as precise dark frame subtraction can be a pretty timeconsuming process). But you may also find a fan blowing air over the camera helps, it certainly does with my 300D.
Terry
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