William Optics Diffraction Spikes Bahtinov Focusing Mask - For Dew Shield 75 mm to 110 mm - BM-DS-GR45 Kite Optics Celestron has designed and engineered

Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions

Shutter Speeds: 1/10000 to 30 seconds

Batteries not included

It is easy to see the moons of Jupiter and the rings of Saturn with this fine instrument

William Optics Diffraction Spikes Bahtinov Focusing Mask - For Dew Shield 75 mm to 110 mm - BM-DS-GR45 Kite Optics Celestron has designed and engineeredWilliam Optics Diffraction Spikes Bahtinov Focusing Mask For Dew Shield 75 mm to 110 mm William Optics Diffraction Spikes Bahtinov Focusing Mask Fits dew shields with diameters of 75 mm to 110 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