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Explore Scientific finder-scope rings are all made for 50mm finders
BK7 prism optics for clear
this air-spaced triplet delivers crisp
Oxygen III - This is the highest contrast Nebula Filter in the series
The 5v output from the USB port can power your devices with a standard user-supplied USB cable
Nebula Filter Oxygen III 1.25-inch Focal Length_3. 1000mm - 1900mm Explore Scientific finder-scope rings areExplore Scientific Nebula Filter 1. 25" O III Range from 483nm to 511nm with peak at 496nm. Transmission 96. 7% Oxygen III This is the highest contrast Nebula Filter in the series, a line filter for only the two emission lines of oxygen. A great choice for observations of supernova remnants and other nebulae that glow in OIII. Other types of objects that glow in all parts of the visible spectrum (e. g. galaxies) are reduced visibly, but some normally
