Optolong 1.25" Filter Set with H-Alpha, SII, and OIII Filters $400

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Enjoy the best of Optolong's deep sky filters with this 3-piece set. This 1.25" filter set features the best-selling 7nm Hydrogen-Alpha filter, 6.5nm Sulfur-II filter, and 6.5nm Oxygen-III filter. All filters are housed in a 1.25" cell. All Optolong filters in this set are made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL.

Optolong 7nm H-Alpha Filter - The Optolong H-Alpha 7nm is an extremely narrow emission-line filter that works by allowing a 7nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths.

Optolong 6.5nm SII Filter - The Optolong Sulfur-II 6.5nm Extra-Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural).

Optolong 6.5nm OIII Filter - The Optolong Oxygen III 6.5nm Extra-Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 500nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural).