Nebula Filter H-Beta 2.0-inch tracker 25" 90° diagonal

25" 90° diagonal

5" hexagonal focuser for fine adjustments

even with gloves on

you see even more universal real estate

while the metal structural design maximizes stiffness with minimal weight

Nebula Filter H-Beta 2.0-inch tracker 25" 90° diagonalExplore 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. This line 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.