FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

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

The Optolong H-Alpha 12nm Narrowband Filter works by permitting a 12nm light bandwidth, focused on the 656nm wavelength through, and hindering the transmission of contrast-killing light pollution wavelengths.

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

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

The Optolong H-Alpha 12nm Narrowband Filter works by permitting a 12nm light bandwidth, focused on the 656nm wavelength through, and hindering the transmission of contrast-killing light pollution wavelengths.

The Optolong H-Alpha 7nm is a very narrow emission-line filter that functions by permitting a 7nm light bandwidth, focused on the 656nm wavelength through, and obstructing the transmission of contrast-killing light-pollution wavelengths.

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

The Optolong H-Alpha 12nm Narrowband Filter works by permitting a 12nm light bandwidth, focused on the 656nm wavelength through, and hindering the transmission of contrast-killing light pollution wavelengths.

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

The Optolong H-Alpha 7nm is a very narrow emission-line filter that functions by permitting a 7nm light bandwidth, focused on the 656nm wavelength through, and obstructing the transmission of contrast-killing light-pollution wavelengths.

The Optolong H-Alpha 12nm Narrowband Filter works by allowing a 12nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths.

The Optolong H-Alpha 12nm Narrowband Filter works by allowing a 12nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths.

FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.