For some unknown reason, my CG5 mount, which had been tracking very accurately up to 2 minutes.......and even 3 minutes at times (unguided), suddenly decided that 2 minutes was too long.....oblong stars. Hmmmmm?
Having no choice, I set up my Starshoot guide camera, got it guiding in PHD......and guess what. No spikes in the Dec axis, not one. It guided smoothly for almost 90 minutes. This time the RA axis was a bit choppy, but it never exceeded 1 pixel in deviation. I can't explain it, but I'll take it. Registered in Deep Sky Stacker, every frame registered with almost identical numbers, and I had to throw out ZERO frames!!! Yeeeee Haaaaaa!
I was going to try the Pacman Nebula NGC 281, but the moon was just too bright, and there was that pesky haze. Rather than get skunked, I settled for another image of M57, the Ring Nebula. It is small, but boy is it bright...moon or no moon! My kinda object!
one hour and ten minutes ( 35 x 120 seconds) @ ISO 800
Captured in Nebulosity, aligned and stacked in Deep Sky Stacker, Guided in PHD, processed in Photo Shop CS with Carboni tools and Gradient Exterminator.
6" f/5 imaging Newtonian, CG5 GT mounted (Guided), Canon 350D main camera, Starshoot II color guide camera.
Yes, I went a bit overboard on the color......so used to not having any. I will learn to tone it down.
* Notice the central star......cropped images show it clearly!