Nebula Filter UHC 1.25-inch Prism System_Roof high-contrast views through its classic

high-contrast views through its classic 102mm crown-and-flint doublet design with a fast f/6

Regardless of the height you choose

finally because Argon is less conductive of heat than Nitrogen

but you also see the main attraction

detailed views of the Moon’s craters

Nebula Filter UHC 1.25-inch Prism System_Roof high-contrast views through its classicExplore Scientific Nebula Filter 1. 25" UHC Range from 458nm to 508nm with peak at 488nm. Transmission 96. 7% UHC This is an ultra high contrast narrow band filter, designed for observing the broad range of nebulae with 1. 25 inch standard eyepieces or filter wheels. The bandpass is tighter than the CLS Nebula Filter, thereby blocking even more light from artificial lights and airglow.