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dennislowe
10-03-2006, 03:42 PM
Anyone use the technique of blinking with an OIII filter to help ID PN's. If so can you recomend a test object so I can get an idea of what I am looking for. I will be using a 200mm F6 Newtonian.
Thanks. Dennis.
dhumpie
10-03-2006, 05:14 PM
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
mickoking
10-03-2006, 09:44 PM
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.
RAJAH235
10-03-2006, 10:31 PM
FWIW, I've found a very light tap on the tube helps. It 'moves' all the image & your 'rods' will pick up the fainter objects, slight movement. Averted vision also helps...
:D L.
dhumpie
13-03-2006, 03:46 PM
You should see me when I am at the ep....I look like the headless horseman only I am not riding a horse :) I use my "jedi" dark cloak everytime I observe. It really helps bring out the extra details in objects.

Darren
Starkler
13-03-2006, 09:57 PM
I use the same technique when hunting faint galaxies brother Jedi :lol:

It certainly helps if the only light reaching ones eye is that comming from the eyepiece.
Merlin66
14-03-2006, 08:57 AM
Hartung used a small prism behind the eyepiece. The PN would appear star like; the background stars would smear into a spectra.
dennislowe
16-03-2006, 06:50 AM
Thanks to all. Ill give the filter a run on my next dark sky trip.
Dennis.
dhumpie
16-03-2006, 06:37 PM
I agree Geoff! Dark jedi cloak plus UHC filters and I am ready for some serious planetary hunting!

Darren
dennislowe
20-03-2006, 11:39 AM
I have not seen IC 2448 yet. However on the night of the 18th I did find NGC 2867 from my back yard, with plenty of light pollution and a bright moon on the horizon. That was a bit of a surprise, and I am sure I would not have been able to ID it without the filter.
Dennis.