William Optics Diffraction Spikes Bahtinov Focusing Mask - Dew Shield 243 mm to 308 mm - BM-DS-GR150 Free Shipping Astronomers quickly learn that viewing

Astronomers quickly learn that viewing the Moon with a telescope (but without any Moon filter) is just too bright for most person's eyes

the 8" optics will show you hundreds of objects inside and outside our solar system

965" insert barrel

up-close views of small subjects when needed

TeleVue NP101is APO - Imaging System Refractor Telescope Features

William Optics Diffraction Spikes Bahtinov Focusing Mask - Dew Shield 243 mm to 308 mm - BM-DS-GR150 Free Shipping Astronomers quickly learn that viewingWilliam Optics Diffraction Spikes Bahtinov Focusing Mask For Dew Shield 243 mm to 308 mm William Optics Diffraction Spikes Bahtinov Focusing Mask Fits dew shields with diameters of 243 mm to 308 mm Clear Acrylic Sheet design provides 92% light transmission Gives the Brightest diffraction spikes for focusing This is a William Optics Diffraction Spikes Bahtinov Focusing Mask made from Acrylic material, which is high in light transmission. This design