A visual filter that blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass.

A visual filter that blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass.

A visual filter that blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass.

Blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass.

With the Hydrogen-Beta line of the spectrum isolated, the Astronomik H-Beta filter can detect faint nebulae like the Horsehead, the Cocoon, or the California.

With the Hydrogen-Beta line of the spectrum isolated, the Astronomik H-Beta filter can detect faint nebulae like the Horsehead, the Cocoon, or the California.

This Astronomik OIII Filter is made for visual observing of gas and planetary nebulae

This Astronomik OIII Filter is made for visual observing of gas and planetary nebulae.

The Astronomik OIII 12nm CCD Filter was designed for astrophotography and has T-threads on both sides, allowing you to attach it to a T-adapter, etc. and still present a T-thread on the other side.