The JMI EV-2N is a fine rack-and-pinion focuser designed to work with Newtonian Telescopes. It is a 2" black-anodized aluminum focuser equipped with rubber grip knobs, standard brass ring and reducer to accept 1.25" eyepieces. The EV-2N can support up to 8 pounds. It features manual control and is over 1 1/2 times finer than any other products of its class. The EV-2N version can mount on a wide range of tubes from 7.5" or larger.
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JMI Telescopes EV-2N Focuser for Newtonian Telescope Review