Celestron 93623 Narrowband Oxygen III 1.25 Filter
by Celestron
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Digital Cameras Photo Reviews of Celestron 93623 Narrowband Oxygen III 1.25 Filter
Customer Review: Celestron OIII Filter
Summary: 4 Stars
Not a bad filter. you'll need it to see some nebula, but just be sure you use it on some of your lower power EPs. On a bright nebula, like the ring, the background will be completely black whith almost no stars, while the ring itself doesn't appear to be any dimmer(it does turn blue in color). At ~80x (under slightly light poluted skies) with my 8" sct the helix nebula is visible, but just barely...enough to know it's there but not really see anything. Without it, the helix isn't visible at all. I've used a 2" version on an Ep that yields around 45x, and under good conditions the view of the helix is stunning. Be aware, it does dim the background stars substantially. You need to know you are pointed in the right area before putting it on.
Judging by the looks and the description, I'd say this it basically the same thing as the Baader planetarium version with a celestron label slapped on it.
If you don't mind the cool aquamarine blue color, it makes a pretty good filter for dimming down a bright moon for a little lunar observation as well. and you can stack it with other filters to further enhance the view.