Please note: This text was taken directly from the manufacturer.
Imaging with extra-narrowband filters is the latest technique used by amateur astronomers for producing striking, high-contrast color CCD astroimages of emission nebulas. And it works even in heavily light polluted or moonlit skies. What you need is this three-filter set, which consists of Orion Hydrogen-alpha (#5587), Oxygen-III (#5578), and Sulfur-II (#5579) extra-narrowband imaging filters (1.25"). These specialized "line" filters transmit only the specific wavelengths of light important in emission nebulas, while blocking out all the rest. The filters are designed for use with the Orion StarShoot Deep Space CCD Monochrome Imager II (#52083) and Manual 5-Filter Wheel (#5520), or with similar cameras. The H-alpha filter has a transmission of 90% at the hydrogen-alpha line of 656.3nm. The O-III filter passes light at the 500.7nm wavelength (the Oxygen-III line) with very high 90% transmission. And the S-II filter passes light at the 672.4nm wavelength (the Sulfur-II line) with 90% transmission. All three filters have a FWHM bandpass of 7nm. So if you're ready to go beyond RGB imaging and capture your favorite nebulas in a revealing new light ﾖ no matter how light-polluted your skies -- add our Extra-Narrowband CCD Imaging Filter Set to your imaging repertoire! Includes a protective plastic case for each filter. One-year limited warranty.
