The Cocoon Nebula IC5146

After cleaning and correctly(!) fitting my LRGB filters I decided to go a for a bright broadband target. Clouds, moon and poor seeing did not help but I managed about 45 mins each for RGB and Ha – shot with the ASI1600mm. This is tight cropped as I combined Ha from two sessions and the framing wasn’t very well repeated. (I really must work out a way to index my camera rotation.)

This is the first full imaging session since changing the RA and DEC boards of the CEM70G. The resolving power (Dawes-limit) for the scope is about 0.45 arc seconds. At this focal length the ASI1600mm pixel size is 0.65 arc seconds. This camera is basically working at the limits of the scope. If you pixel-peep this image even with the poor seeing you can tell the CEM70G is now getting the most out of the combination. An OAG may give me fewer reject subs but I am very happy using my 60mm guidescope +ASI290 guide camera.

Aperture 250mm /9.84 inches
Maximum Magnification :500x
Resolving Limit (Dawes): :0.46″ arcseconds
Native Focal Length / F: 1200mm / F4.8
Ideal Resolution : 0.67″ – 2″ arcseconds
Resolution 0.65″ arcseconds per pixel
SamplingSlight Oversampling ✅

Camera Chip FOV 0.84° x 0.64°

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