0.5x focal reducer screws on to any 1.25-inch eyepieces barrel and provides a nominal reduction of 0.5X. This package comes with a 25 mm extension tube for further reduction. The actual focal length reduction will vary a little depending on where the focal reducer is placed in the optical path. The reducer features a 2-element fully multi-coated optical design and blackened lens edges in a black anodized aluminum filter cell. It also has additional 1.25-inch filter threads, so you can screw/stack additional filters on to this reducer.
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