In south western Serpens Cauda is a very interesting planetary nebula. It goes by some rather sterile names such as, PK 010+18.2 and Minkowski 2-9, but my favorite is the common name, "The Butterfly Nebula". As you can see it fits its name wonderfully. I observed this for the first time on the evening of Aug 1/08 with my 12.5 inch dob. I was at the observatory at Pearson College. I also had the dome with the 25inch open so went in and had a look. The amount of structure this planetary showed was remarkable. This is how I saw it with the f/5 25" newtonian at 304X magnification (12mm Speers WALER with Paracorr). No filter was used. Personally I found an OIII or Ultrablock didn't help the view. In fact I found they hindered it, because they dimmed the central star.

I know this was a view with a rather large scope but even with my 12.5" the nebula was still clearly bi-lobed and the 14.5 mag central star winked in and out.

It you ever have the chance from a dark location to point a scope with reasonable aperture at this area of the sky, I suggest mark this PN on your list of to see objects