Most of us know the little planetary NGC 2438 in the middle of the cluster.
But....can you spot PK231+4.1?
This planetary measures only 0.6'x0.5' at mag 14.4!
The highlighted objects can be seen in the next image.

Imaged with the Boren-Simon 8" F/2.8 POWERNEWT Astrograph.
SBIG ST8300M camera with SBIG Filterwheel with BAADER LRGB filters.
EQ6 PRO mount with PHD guiding.
24x1 min for luminance bin x1
6 min per RGB channel bin X2
Total of 42 minutes.
Imaged from the NEGEV desert in ISRAEL on March 31st 2011