Orion Oxygen-III Filter 2-inch
|Orion 05582 Oxygen-III filter increases contrast on supernovae remnants such as the Veil Nebula and may be used with 2" eyepieces or filter slides. Two inch filters such as this may cost a little more, but they offer more flexibility than their 1.25-inch counterparts when used with telescopes capable of accepting them. Most high quality 2-inch refractor style star diagonals have a nosepiece that is threaded for 2-inch filters. Placing a filter in your star diagonal allows you to change eyepieces without having to fumble around in the dark moving a filter between eyepieces. What's more, using this approach allows you share a single filter between your 1.25-inch and 2-inch eyepieces. Many of the large truss tube Dobsonian telescopes can be fitted with 2-inch filter slides, providing the same one size fits all benefits. |
You can't turn up the luminosity on nebulas, but you can crank up the contrast between them and the sky to reveal more of their wondrous detail. Our Oxygen-III telescope filter provides extremely selective filtration to bring out elusive detail in diffuse and planetary nebulas. It does so by transmitting close to 90% of the light corresponding to the two oxygen-III spectral lines at 496nm and 501nm while completely blocking virtually all other wavelengths. The results are remarkable. You'll see more detail than you ever could before in nebular gems such as the Swan, Ring, Dumbbell, Helix, and Eagle, to name a few. The O-III provides an even greater contrast boost on some objects than the UltraBlock narrowband telescope filter. And for nebulas, every little bit helps! Try the Oxygen-III telescope filter with a low-power 2" telescope eyepiece and take in the whole Veil Nebula. Wow!