William Optics Gold Bahtinov Mask Cover For ZenithStar 61 Telescope - CPBM-61GD Kite Optics Monoculars The reason is to avoid

The reason is to avoid damaging your expensive 2" filter when you drop an 1

center and edge

PERFORMANCE - For objects near the Meridian (imaginary line passing from North to South)

focusing will be "even better than you imagined

William Optics Gold Bahtinov Mask Cover For ZenithStar 61 Telescope - CPBM-61GD Kite Optics Monoculars The reason is to avoidWilliam Optics Gold Bahtinov Mask Cover For WO ZenithStar 61 Telescope William Optics Bahtinov Focusing Mask and Dust Cap Innovative Design combines Dust Cover and a Bahtinov Mask in one Fits WO ZenithStar 61 Telescope Clear Acrylic Sheet design provides 92% light transmission Gives the Brightest diffraction spikes to assist focusing This is a William Optics Gold Bahtinov Focusing Mask and Dust Cap, made from Acrylic material, which is high in light