ETC 400DN Donut, 6.25-Inch / 159-Millimeter with 2.5-Inch / 63-Millimeter Aperture - Black
Reduces flare in template projections. Fits 19º-50º ETC Source Four & ETC Source Four Jr. 6.25".
Reduces flare in template projections. Fits 19º-50º ETC Source Four & ETC Source Four Jr. 6.25".