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Wide 42-inch footprint
This makes it easier to observe comfortably without constant adjustment
Discover the inner beauty hidden inside common rocks with the Explore One Rock Tumbler that mimics natural weathering processes
this bundle includes Explore Scientific's Essential Series 80 mm Air-Spaced Triplet Refractor
the wonder of real celestial observation
Nebula Filter H-Beta 2.0-inch Optical Design_Newtonian Wide 42-inch footprintExplore 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.
