Explore Scientific Nebula Filter 1.25″ H-Beta Range from 478nm to 496nm with peak at 489nm. Transmission 94.5%

H-Beta– Hydrogen is the most abundant element in the universe and many nebulae glow in the light of H-beta. Thisline filter blocks all other wavelengths(and thereby nearly all of the artificial light) and only the emission line of hydrogen beta will pass. This filter fits all standard 2.0-inch eyepieces and filter wheels.