The JMI RCF-1 is a reverse Crayford focuser designed to work with Newtonian Telescopes. It is a 2" black-anodized aluminum focuser equipped with knurled knobs. The RCF-1 features manual control for focusing, which is over 1 1/2 times finer than any other products of its class.
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JMI Telescopes RCF-1 Focuser for Newtonian Telescope 2" Review