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The JMI EV-3NM is a fine motorized 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-3NM 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-3NM motorized version can mount on a wide range of tubes from 7.5" or larger.
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JMI Telescopes EV-3NM Focuser for Newtonian Telescope with Motor Review