Hi
Got NGC 5128 with Houghys cooled , modded 350D tonight. Longer subs this time, 15 mins each, 4 of. 1 hour total time
uv/ir filter, 10 inch f5.6 scope. Hand off axis guided. Processed as usual in Iris with dark, flats and offset frames, then Photoshop and PSP. Taken from my Wallsend backyard, fairly light polluted skies.
Scott
Many thanks all.
In Iris, I draw a small box over a blank area of sky without stars, then type in "white" in command line box, it instantly neutralizes the sky background, compensating for any colour casts. It works great
Scott
To show the incredible difference cooling makes. Here is a version that was just aligned and stacked with no dark subtraction at all! Colour balance is a bit off, but where are the hot pixels? very few exist. I evened out the field with Gradient xterminator, that removed most of the amp glow too, but it wouldnot remove hot pixels. When I examined the 15 minute dark I also took, I could only see the odd "deviant pixels" those that are always hot regardless of temperature, the background of scattered coloured pixels are totally gone, its astounding. I reckon a 24 hour single image would have less noise than a 1 hour one at room temperature.
Scott
Thanks
IRIS processes in .PIC format, I then save it as a .tiff, then open it in Photoshop and finish processing from there. Usually the white command works great in IRIS, as it makes the sky background neutral gray. I will do processing like colour and dymanic stretching in Iris then save as tiff and finish up in Photoshop.
Scott
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