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The JMI Telescopes Event Horizon EV-1R is a 2" black-anodized aluminum focuser with rubber grip gold knobs. The focuser lifts up to 8 pounds. Dual-speed manual controls are over 15 times finer (small outer knob) and 1.5 times finer (large inner knob) than most rack-and-pinion focusers. The EV-1R mounts in many refractors with an inside diameter of approximately 3.5" or 3.75".
Partial List of Refractor Telescopes that Should Accept the Focuser:
Celestron: C4-R, C6-R, C6-RGT
Orion: AstroView 100 EQ / 120ST EQ, SkyView Pro 120