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The TP-88EC Prism Unit from Kowa is an adapter that allows you to easily convert your TP-556 Prominar 500mm f/5.6 telephoto lens into a spotting scope. Using a user-supplied TSN-880 or 770 series spotting scope eyepiece, the Prism Unit will turn the lens into a full-functioning medium/long-range spotting scope. It can also be used with the TSN-EC3 eyepiece converter to utilize TSN-660 and 600 series spotting scope eyepieces.