JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian
JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian
JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian
JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian
JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian

JMI EV-1n Dual-Speed Event Horizon Telescope Focuser - Newtonian

  • Vendor
    Optical Structures
    Sale price
    $406.00
    Regular price
    $406.00
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    Why Buy From Clarity Scopes
    A masterpiece of engineering and workmanship, JMI Dual-Speed Event Horizon Telescope Focuser - Newtonian is a low-profile, friction-drive focuser designed for both the amateur and professional telescope market.

    The highly acclaimed Crayford design uses high pressure on a metal drive shaft pressing against a 3" metal drawtube which is held by bearings on the opposing side. This direct surface-to-surface drive mechanism eliminates backlash and shifting of the drawtube as seen in other designs such as the rack-and-pinion focuser, and allows for very fine adjustments. Zero image shift and zero backlash makes this focuser fantastic for visual and photographic work and a must for CCD imaging.

    Featuring a 2″ black-anodized aluminum focuser design with dual-speed drive, pusher bearing, rubber grip gold knobs and two-speed operation. The focuser lifts up to 8 pounds and its dual-speed manual controls are over 15 times finer (small outer knob) and 1½ times finer (large inner knob) than most rack-and-pinion focusers, with a 9:1 ratio. Includes a compression ring in the drawtube for holding telescope eyepieces and accessories without scratching the equipment. The adjusting screw presses against the ring which tightens around the eyepiece or accessory.

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