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Originally Posted by dhumpie
I have done heaps of blinking with my old Lumicon UHC to identify starlike PN. When you move the filter in and out of the field, the stars dim but the PN does not. For starters you can try one of the starlike PN's like the blue planetary in Crux or the other one (very bad with NGC numbers) at the foot of the false cross. I am at work so I don't have access to my star maps....
Darren
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IC 2448 is the planetery in the false cross (I think) and yes it is a good test coz I used the blinking technique to find that object. Planetaries are quite obvious in OIII filters.