Experiments with planetary nebulae

Last session of this fantastic three nights campaign. I managed to shot a faint on edge galaxy and experimented a bit with two small planetary nebulae...
Quite honestly I didn't know how to approach them because before I only had worked with two very brilliant PN (Ring and Dumbbell). I tried several exposure discovering that over 10 secs the frames were overexposed. So I shooted 30 10secs frames of each, but when composed in DSS the result was a bright disk with no details. Here attached you find single 10 secs images.

NGC891

Canon at the prime focus of C8 (tracking not guided)

160x60 sec frames , 50 dark , ISO 800 

stacked with DSS and elaborated with Gimp

NGC7662 - Blue Snowball Nebula

Canon at the prime focus of C8 (tracking not guided)

10 sec single frame, ISO 800 

NGC6543 - Cat Eye Nebula

Canon at the prime focus of C8 (tracking not guided)

10 sec single frame, ISO 800