promising bubble

I had the fortune of having to find out what was wrong with the stars here.
First diagnosis turned out correct; the filter screwed onto the end of the cc.

Replace with the clip CLS and...

Not as well defined -maybe the seeing was not as good- but at least no tail. Managed 7 snaps of...
nebula ngc7635 bubble and cluster m52 in cepheus
700d CLS + pn208 7 x 300s @ ISO 800