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Vixen Focal Reducer - ED, ED81S, ED103S, ED115S 3666 is an accessory for your Vixen Telescope. The Vixen Focal Reducer 3666 is usable with VixenED81S, ED103S, and ED115STelescopes. The Vixen Focal Reducer for ED reduces focal length by 0.67x, 625mm to 419mm (F5.2) for ED81S, 795mm to 533mm (F5.2) for ED103S, 890mm to 596mm (F5.2) for ED115S. Weight of the Vixen ED Focal Reducer is 6.14 oz (174 g). We offer a complete line of Vixen Telescope Accessories. For our complete selection of products by Vixen on sale please visit our Vixen page. For more Telescope Accessories please visit our Telescope Accessories store section.