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The JMI EV-1N is a Crayford-style 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-1N can support up to 8 pounds. It features dual-speed manual control capability for rapid and fine focus. The rapid focus adjustment is 1 1/2 times faster, and the fine focus adjustment is 15 times finer than any other products of its class.