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Collapsible
The Explore Scientific S-II filter uses the property of the so-called emission mist
and a central carrying handle ensures secure transport and tripod assembly
The 5v output from the USB port can power your devices with a standard user-supplied USB cable
this air-spaced triplet delivers crisp
Nebula Filter Oxygen III 1.25-inch Focal Length_3. 1000mm - 1900mm CollapsibleExplore 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
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