<p>This geared ring is purposed to be installed on KMZ Mir-11M lens with Krasnogorsk-2 mount.</p> <p>Only difference from Mir-11 version is absence of adjustment rim since aperture ring on Mir-11 lens has same diameter as focus ring, and gear with the rim can't pass it.</p> <p>Installation is very simple - just put the gear over original ring and secure three set screws by means of included hex key.</p> <p>If you don't need the gear anymore, removing is very simple as well - loose three set screw and pull the gear off the lens.</p> <p>Installation/removing takes about one minute, and doesn't require any special skills.</p> <p>Dimensions:</p> <p>Inner diameter - 65 mm;</p> <p>Outer diameter -73.6 mm;</p> <p>Thickness - 5 mm.</p> <p>Mod - 0.8 mm (pitch 32).</p> <p>& </p>