Nice one raymo! I'm surprised you see so much with a dSLR and 90s exposures... I've been trying to capture this one with a mono CCD and it's pretty dim; I'm taking 600s exposures! Looking at your effort here with 90s maybe I should cut back and just take more of them...
It's an 600mm F7.5 refractor, so it's about twice as slow as your scope, but the camera is also undersampled and yours would be oversampled so that would offset it somewhat.
Nice Raymo. I have imaged NGC55 recently at Bretti and tried 10 minute guided subs at ISO800 - which looked great initially in test subs on the Canon screen but enlarged later in Photoshop showed slight star trails - so I have to reshoot soon. I think I will drop back to 3 and 5 minute subs next time. I try to resist using ISO1600 because of noise but you've convinced me to try it.
Thanks Glen, Cam, and Jo.
Glen, I don't know about you, but after my first full length sub
I magnify the screen to it's max to check for trailing, and about half way through the series I do it again to check that focus hasn't changed. I am working on a crude home made cooler box so that I can hopefully continue to use 1600 through the
summer. I seem to recall hearing somewhere that once you get over about 5 mins, diminishing returns start to creep in; I
wouldn't know from experience, having never tried anything over 2 mins since leaving film behind.
raymo
Last edited by raymo; 01-10-2014 at 11:57 AM.
Reason: more info
nice one raymo - very nice, and good colour,
after my recent grus quartet I think I am of the opinion that dslr's are better suited to galaxies than other DSOs.
