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Thanks all.
I havent tried 4 x 5 mins yet, guess Im a bit lazy and its quicker stacking less images, Im not sure how readout noise comes into play, though I should try shorter shots with more of them and see what happens.
Yes Im getting more noise, the originals very speckly with big amp glow on the right side. Dark subtraction with IRIS helps, can also do it manually with Photoshop, though to avoid coloured spots I use Levels to cut back the blue and green channels of the dark frame, basically only subtracting the red channel. I stretch levels to try and bring out the object from the sky background. Noiseware software cleans up residual noise reasonably well.
Scott
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