William Optics Bahtinov Mask for Dew Shields - 105-148mm Diameter
$56.00
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This optical acrylic sheet offers 92% of light transmission that will give you the biggest and brightest diffraction spikes when focusing. This acrylic mask delivers 3 times brighter diffraction spikes than traditional metal masks. - Diffraction Spikes: Bahtinov focusing mask Made for telescope dew shield diameters of 105 mm to 148 mm (4.13-inches to 5.826-inches).
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