Caldwell Objects
I recommend a book entitled 'The Caldwell Objects' by Stephen James O'Meara, 2002
Note: This gallery should be automatically sorted by Caldwell #.
Caldwell 94 - NGC4755 - Jewel Box Cluster near Becrux - 23/2/2014 (Processed stack)
First night re-acquainting myself with the 8" PowerNewt I had previously borrowed from Jean-Marie Locci, but that I recently purchase from him.
Noticeable Coma in outer edges but concentrated on one side - non-squareness of imaging plane perhaps?
Noticeable Vignetting without Flats
DeepSkyStacker 3.3.3b51 Stacked 85% of 16 Images ISO 800 30 Sec, 32 DARK @ 120 Sec, 32 BIAS, 0 FLATS, Post-processed with Adobe Photoshop CC
Telescope - PowerNewt 200mm f/4 with PowerNewt(ASA) f/2.84 Reducer/Coma Corrector, No LPS filter, Baader BCF modified Canon 70D DSLR field 90' x 134' , Ambient 25C. EQMOD EQASCOM with Ascom 6 for mount control. Backyard EOS Pro 3.0.3 for Image acquisition. Mount - Skywatcher NEQ6 Pro. Guidescope - Orion ShortTube 80 with Starlight Xpress SuperStar (Mono) CCD Auto Guider and Stark Labs PHD auto guiding software.
NGCNGC4755 C94 Jewel Box ClusterOpen ClusterCaldwellC94 Jewel Box ClusterStarBecrux Beta Crucis
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