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The Replacement Threaded Flange for Shutter Size 3 for Extension Lens Board 4570 from Wista is a spare threaded flange for a shutter size of 3, for use with the Extension Lens Board with 0, 1 and 3 Flanges for Technical, DX, Tachihara and Linhof cameras. This flange replaces the Size 3 flange that came with your extension lens board.