The JMI EV-3N is a fine rack-and-pinion focuser designed to work with Newtonian Telescopes. It is a 2" black-anodized aluminum focuser equipped with knurled knobs, standard brass ring and reducer to accept 1.25" eyepieces. The EV-3N can support up to 4 pounds. It features manual control and is over 1 1/2 times finer than any other products of its class. The EV-3N version can mount on a wide range of tubes from 7.5" or larger.