Quote:
Originally Posted by Moonboy
oh, I didnt realize that 
I was talking specifically about the secondary mirror cell's, spiders and Orion Oxygen III
kind regards
Gus
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Yep, that 1.25" OIII filter would be a useful aid to "blinking" planetary nebulae in the eyepiece. (Cheaper than the GSO (Bintel-branded) 1.25" OIII filter that I use!)