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The longest focal length in the 52° Series with the longest eye relief
Featuring K9 Porro prism optics and multi-coated lenses
A simple photo tripod with a ball head or video tilt head is quickly overwhelmed here
precise adjustments
The fully multi-coated optics ensure maximum light transmission
Nebula Filter H-Beta 1.25-inch Series_82° LER The longest focal length inExplore 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 1. 25 inch eyepieces and filter wheels.
