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This 2" Comet Hunter Focuser from Explore Scientific is a dual-speed Crayford style focuser. It comes with the Comet Hunter telescope, and is sold here as a spare part or replacement.
It has two large, knurled 10:1 micro-focusing knobs, and on rough-focus knob. Tension adjustment allows you to lock or adjust the tension on the drawtube when you increase or decrease the weight of your accessories.
A graduated scale is imprinted on the drawtube, and a 1.25" compression ring eyepiece adapter is included with the focuser.