Bubble Nebula Ha

[Rodd]

I have wanted to image the Bubble with the C11Edge for years.  I have shot it several times at lesser focal lengths and aperture--and the images hold up well to cropping and enlargement.  But I have always wondered if they can stand up to a native focal length of 1,960 and 11" of aperture.  I guess seeing is critical to the issue.  I do not recall the quality of seeing for my previous Bubble sessions.  Seeing for this one was pretty good.  The FWHM for the stack is about 2.1.  Not bad, but I was hoping for <2.0 as seeing was forcastted to be much better than usual.  Guiding was excellent and I am always meticulous about focus.  So I think seeing is the limiting factor (perhaps influencved by tube currents, as the temp was on the cool side and falling.  

C11Edge with .7x reducer OAG and ASI 1600.  120 300sec Ha subs (10 hours)

Bin1

 

Bin2

[Rodd]

This is s duplicate post. Please delete