My son and I imaged Omega Centauri last night-despite a bright half moon - with the Canon 300D and Celestron C8 NGT, autoguided with GuideDog(Atik 1 c webcam @2 seconds exposure , 60 mm refractor guide scope). Manual focus.
composite of two images at ISO 1600-one exposure was of 224 seconds and the second was a 20 second exposure.
Gradient removed in photoshop, also levels stretched , brightness and contrast tweaked.
Noise removed in NeatImage.
Nah, Seeker, that's not good enough. On close inspection your picture is obviously a fake. It is a good fake but it is a fake. There is a photo of NGC 5189 on the wall at Monash Uni Physics Department and it looks nothing like the digital so-called photo you've posted here.
Originally posted by acropolite I got one word. Magnificent..... Sorry that was 5...... Take note of that you Nikon Lovers.....The original must be awesome.
Lovely shot - beautiful image....
.....I think it also may have a tiny bit to do with the skill behind the scope set-up, guiding & imaging too.
Regards,Nikon Lover
I have to say I think autoguiding has made a quantum difference to image quality...even spending hours trying to drift align never gave me the tracking accuracy to allow really long exposures.
It is a fabulous shot Seeker, worthy of any world astro/science mag.
Just a question, you say auto guiding has made all the difference but exactly how good was your polar alignment to start with?Was it spot on, near enough, kinda close, a little bit out, really near to the SCP.....how good was it?
Focusing is brilliant too. Any tricks or masks there or trial & error?
for this particular image polar alignment was way way off. ..usually it is much better, but still I had no problem with individual images. However when you go to stack a number of image I found some field rotation..that is because it was so hopelessly far out
focus is pure trial and error..
I have to try DSLR focus though as I hear it is very good-written by an Aussie and costs around $50