Products

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 ...

Designed for 150mm Newtonian Telescopes Classic Dobsonian Alt-Azimuth Design Intuitive Point-and-View Operation Stable, Ground-Based Platform Manu...

150mm aperture, f/4 Research grade, 1/8 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descriptio...

150mm aperture, f/5 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descriptio...

150mm aperture, f/8 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descriptio...

Recommended for the 150mm Dobsonian mount Smooth, controllable altitude motion CNC machined in the UK Description Specifications In the Box War...

Sized for 150mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 6...

Sized for 150mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 150mm Trunion Rings, Spacers and B...

Designed for 200mm (8-inch) Newtonian Telescopes Accepts Optical Tubes up to 225mm in Diameter Classic Dobsonian Rocker-Box Design Provides a Stab...

200mm aperture, f/4.5 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descript...

200mm aperture, f/6 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descriptio...

Recommended for the 200mm Dobsonian mount Smooth, controllable altitude motion CNC machined in the UK Description Specifications In the Box War...

Sized for 200mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 8...

Sized for 200mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 200mm Trunion Rings, Spacers and B...

Designed for 250mm (10-inch) class Newtonian telescopes Accepts optical tubes with an outer diameter up to 280mm Classic Dobsonian rocker box desi...

250mm aperture, f/4.8 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descript...

250mm aperture, f/6.3 Standard grade, 1/4 PV wavefront accuracy Hand-figured in the UK Supplied with a Zygo interferometer test report Descript...

Recommended for the 250mm Dobsonian mount Smooth, controllable altitude motion CNC machined in the UK Description Specifications In the Box War...

Sized for 250mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 1...

Sized for 250mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 250mm Trunion Rings, Spacers and B...