Vixen Optics ED80Sf Focal Reducer for Nikon
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The Vixen Optics ED80Sf Focal Reducer for Nikon reduces the focal length of your telescope optics by 0.85x. For example, a 600mm focal length optical tube (at f/6.4) becomes a 510mm focal length (at f/6.4) with the focal reducer attached. This useful digiscoping accessory lens includes an adapter compatible with Nikon digital cameras.