| PRODUCT DETAILS | | Celestron 93623 Narrowband Oxygen III 1.25 Filter |  | |
Celestron 93623 Narrowband Oxygen III 1.25 Filter
The OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects. Each filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm. This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.
Manufacturer: Celestron
Price: $66.91
 Celestron 93623 Narrowband Oxygen III 1.25 Filter
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| User Reviews |  | Celestron OIII Filter
rating: 4
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.
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Great for viewing nebula
rating: 5
This filter works great for bringing out contrast in the Orion nebula.
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Celestron 93623 Narrowband Oxygen III 1.25 Filter
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