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Explore Scientific Rack and Pinion Focuser Extension Tube adds 1
even with gloves on
you see even more universal real estate
simply back the thumbscrews out so that you’ve opened up the full inside diameter of the rings
Nebula Filter H-Beta 2.0-inch tracker Explore Scientific Rack and PinionExplore 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.
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