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The JMI Next Generation is a fine rack-and-pinion focuser designed for use on large (10" to 16") Cassegrain telescopes. It is a 3" anodized aluminum focuser equipped with rubber grip knobs, standard brass ring and a 2" eyepiece adapter to accept 2" eyepieces. It features dual-speed manual controls for rapid and fine focus, which are over 13 times finer than any other products of its class. This version can lift up to 8 pounds.
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JMI Telescopes Next Generation Focuser for Cassegrain 3" Review