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Thanks all
gee, Bert the benefit of sensor cooling can really be seen there. With mine the sensor temp was about 4 degrees. It was also VERY dewy too, so the inbuilt antidew heater works well, keeping dew off the sensor window.
There is definately a bit of an issue with flatfields though, to do with the HA filter I think, as I had to use Gradient Xterminator to try and get rid of brightening in centre of field, despite taking flats. I used the white screen from my laptop as the lightsource for the flats but that doesnt seem to be working
The original image's backgrounds were quite red, some moonlight getting through, I must try it again without the moon to see how much better it is. The Ha filter, being an interference filter is affected by a wide light cone, such as with such a fast f2.8 system, so dark skies would definately improve things further.
Scott
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