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Ships within 48 hours · Estimated delivery Aug 5 - Aug 10
With an impressive 1900mm focal length and a slow f/15 focal ratio
5" hexagonal focuser for fine adjustments
Explore Scientific Rack and Pinion Focuser Extension Tube adds 1
even with gloves on
Universal use with different binoculars is therefore possible
Nebula Filter H-Beta 2.0-inch tracker With an impressive 1900mm focalExplore 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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