The JMI Next Generation is a fine motorized 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. The motorized version can lift up to 18 pounds and comes with the hand unit.
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JMI Telescopes Next Generation Focuser for Cassegrain 3" with Motor Review