optolong

18nm Bandpass Centered on OIII Emission Lines (500nm) Greater than 80% Average Light Transmission (Tave) Blocks >99% of Major Light Pollution L...

3nm Spectral Bandpass 500nm Central Wavelength (OIII) Ion-Assisted Multi-Layer Coatings Optimized for Monochrome Cameras Available in 2" Mounted o...

6.5nm Narrowband OIII Filter Centered on 500nm Wavelength Passes the 500.7nm OIII Emission Line Blocks Light Pollution and Skyglow Ideal for SHO H...

Isolates the Sulfur-II (SII) emission line for astrophotography Extremely narrow 3nm bandpass for maximum contrast Drastically reduces skyglow and...

Isolates the Sulfur-II (SII) emission line at 672nm Tight 6.5nm bandpass for maximum contrast Enables imaging in heavily light-polluted skies and ...

Reduces skyglow from artificial and natural light pollution Blocks >99% of mercury vapor and sodium vapor light Passes key nebula emission line...

Blocks Ultraviolet (UV) and Infrared (IR) wavelengths Improves image sharpness and reduces star bloat Functions as a luminance (L) filter for mono...

Continuously Variable Light Transmission Available in 1.25" and 2" Barrel Sizes Ideal for Lunar, Planetary, and Terrestrial Viewing Reduces Glare ...