Bubble II, NGC 7635 (September 2016)

Here is another Bubble.  This image is a stack of 7x600" with an H-alpha filter through the CFF290 Classical Cassegrain at f/7.93.  The camera is an SXVF-H9.

I made three mistakes in the version published earlier this month: 1) collimation was slightly off and 2) part of my guide camera was loose.  These resulted in some slightly non-round stars I fixed as well as I could.  This image suffered from none of these.  However, this later image was taken on a night when the seeing was not quite as good.  Still, it's a lot of fun to see this object at this magnification.