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Thanks Jase & Stuart. These imaging sessions gave me quite a valuable insight into just what is required to produce nice looking, long focal length, long exposure, clean LRGB DSO images.
The EM200 was auto guiding so well that as I ran the sub frames as an animation, there was absolutely no drift between sub frames, although some frames did have slightly oval stars. However, I’ll have to look into the topic and practice of dithering as I think with the ST4000XCM in particular, the somewhat noisy background just stacked up and amplified when I combined the sub frames. I did use the hot pixel removal tool in CCDSoft on the original FITs files and that helped some.
I takes me hat off to those long focal length, 10min+ LRGB astro photographers out there; your skills and dedication to this black art astound me, as well as the results you post!
The ST4000XCM with its ST237 guide chip was a real pleasure to use – thanks Gerald. The Real Estate was just enormous at 2048x2048, although I had to bin at 2x2 to increase the flux due to the relatively slow F9.6 speed.
I was beaming all night, right through to 5:15am with the acres of open space on the ST237 sized guide chip compared to my TC211!
Cheers
Dennis
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