Amazon.com : SVBONY SV132 Telescope Filter H-Beta Filter 25nm 1.25 inches Eyepiece Filter for Horsehead Nebula California and Cocoon Nebulae in Dark Skies : Electronics
Horse Head Nebula (IC 434 ) in H-alpha and H-Beta ( Craney ) - AstroBin
Astronomik H-beta Filter | First Light Optics
Antlia H-beta and OIII Filter for the visual and photography - ANTLIA ASTRONOMY FILTER
Choosing between H-alpha and H-beta filters - Deep Sky Observing - Cloudy Nights
Useful Filters For Viewing Deep-Sky Objects | Prairie Astronomy Club
Amazon.com : SVBONY SV132 Telescope Filter H-Beta Filter 25nm 1.25 inches Eyepiece Filter for Horsehead Nebula California and Cocoon Nebulae in Dark Skies : Electronics