The Event Horizon Focuser (EV) is a low-profile, friction-drive focuser designed for both the amateur and professional market.  The highly acclaimed Crayford design (see below) permits tolerances up to 100 times better than conventional rack-and-pinion focusers.  Zero image shift and zero backlash makes it fantastic for visual and photographic work and a  must for CCD imaging. 


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Product Image Price- Item Name

JMI Next Generation Focuser NGF-XT (Newtonian with Motor) $697.00

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JMI Next Generation Focuser NGF-XT (Newtonian with Motor)

JMI NGF-XT Focuser  (Newtonian with Motor)   A 3" black-anodized (gold-anodized optional) aluminum "Extreme" focuser designed for use on large (10" to 16") Cassegrain Telescopes (NGF-XTc) with standard output threads and...

JMI Next Generation Focuser NGF-XT (Cassegrain with Motor) $697.00

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JMI Next Generation Focuser NGF-XT (Cassegrain with Motor)

JMI NGF-XT Focuser  (Cassegrain with Motor)   A 3" black-anodized (gold-anodized optional) aluminum "Extreme" focuser designed for use on large (10" to 16") Cassegrain Telescopes (NGF-XTc) with standard output threads and...

JMI EV-1 Telescope Focuser (Refractor with motor) $546.00

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JMI EV-1 Telescope Focuser (Refractor with motor)

JMI EV-1 Telescope Focuser  (Refractor with motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...

JMI Next Generation Focuser NGF-XT (Newtonian) $546.00

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JMI Next Generation Focuser NGF-XT (Newtonian)

JMI NGF-XT Focuser  (Newtonian)   A 3" black-anodized (gold-anodized optional) aluminum "Extreme" focuser designed for use on large (10" to 16") Cassegrain Telescopes (NGF-XTc) with standard output threads and Newtonian...

JMI Next Generation Focuser NGF-XT (Cassegrain) $546.00

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JMI Next Generation Focuser NGF-XT (Cassegrain)

JMI NGF-XT Focuser  (Cassegrain)   A 3" black-anodized (gold-anodized optional) aluminum "Extreme" focuser designed for use on large (10" to 16") Cassegrain Telescopes (NGF-XTc) with standard output threads and Newtonian...

JMI EV-1 Telescope Focuser (Newtonian with Motor) $489.00

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JMI EV-1 Telescope Focuser (Newtonian with Motor)

JMI EV-1 Telescope Focuser (Newtonian with Motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...

JMI EV-1 Telescope Focuser (Cassegrain with Motor) $480.00

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JMI EV-1 Telescope Focuser (Cassegrain with Motor)

JMI EV-1 Telescope Focuser (Cassegrain with Motor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times...

JMI EV-2 Telescope Focuser (Refractor with motor) $461.00

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JMI EV-2 Telescope Focuser (Refractor with motor)

JMI EV-2 Telescope Focuser (Refractor with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-2 Telescope Focuser (Newtonian with motor) $404.00

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JMI EV-2 Telescope Focuser (Newtonian with motor)

JMI EV-2 Telescope Focuser (Newtonian with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-3 Telescope Focuser (Refractor with motor) $404.00

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JMI EV-3 Telescope Focuser (Refractor with motor)

JMI EV-3 Telescope Focuser (Refractor with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-1 Telescope Focuser (Refractor) $395.00

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JMI EV-1 Telescope Focuser (Refractor)

JMI EV-1 Telescope Focuser  (Refractor) The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small...

JMI EV-2 Telescope Focuser (Cassegrain with motor) $395.00

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JMI EV-2 Telescope Focuser (Cassegrain with motor)

JMI EV-2 Telescope Focuser (Cassegrain with motor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion...

JMI EV-3 Telescope Focuser (Newtonian with motor) $348.00

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JMI EV-3 Telescope Focuser (Newtonian with motor)

JMI EV-3 Telescope Focuser (Newtonian with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-1 Telescope Focuser (Newtonian) $338.00

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JMI EV-1 Telescope Focuser (Newtonian)

JMI EV-1 Telescope Focuser The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small outer knob)...

JMI EV-3 Telescope Focuser (Cassegrain with motor) $338.00

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JMI EV-3 Telescope Focuser (Cassegrain with motor)

JMI EV-3 Telescope Focuser (Cassegrain with motor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers....

JMI EV-1 Telescope Focuser (Cassegrain) $329.00

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JMI EV-1 Telescope Focuser (Cassegrain)

JMI EV-1 Telescope Focuser The Event Horizon EV-1 is a 2" black-anodized aluminum focuser with rubber grip knobs and two-speed operation.  The focuser lifts up to 8 pounds.  Dual-speed manual controls are over 15 times finer (small outer knob)...

JMI EV-2 Telescope Focuser (Refractor) $310.00

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JMI EV-2 Telescope Focuser (Refractor)

JMI EV-2 Telescope Focuser (Refractor) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI Reverse Crayford 2" Focuser with Motor $296.00

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JMI Reverse Crayford 2" Focuser with Motor

JMI Reverse Crayford 2" Focuser with Motor A 1.25" Reverse Crayford focuser.  Motorized version include a standard hand unit.  For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to...

JMI Reverse Crayford 1¼" Focuser with Motor $274.00

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JMI Reverse Crayford 1¼" Focuser with Motor

JMI Reverse Crayford 1¼" Focuser with Motor For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius.  Please specify...

JMI EV-2 Telescope Focuser (Newtonian) $253.00

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JMI EV-2 Telescope Focuser (Newtonian)

JMI EV-2 Telescope Focuser (Newtonian) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-3 Telescope Focuser (Refractor) $253.00

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JMI EV-3 Telescope Focuser (Refractor)

JMI EV-3 Telescope Focuser (Refractor) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-2 Telescope Focuser (Cassegrain) $244.00

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JMI EV-2 Telescope Focuser (Cassegrain)

JMI EV-2 Telescope Focuser  (Cassegrain) The Event Horizon EV-2 is a 2" black-anodized aluminum focuser with rubber grip knobs.  The focuser lifts up to 8 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-3 Telescope Focuser (Newtonian) $197.00

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JMI EV-3 Telescope Focuser (Newtonian)

JMI EV-3 Telescope Focuser (Newtonian) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI EV-3 Telescope Focuser (Cassegrain) $187.00

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JMI EV-3 Telescope Focuser (Cassegrain)

JMI EV-3 Telescope Focuser (Cassegrain) The Event Horizon EV-3 is a 2" black-anodized aluminum focuser with knurled knobs.  The focuser lifts up to 4 pounds.  Manual control is over 1½ times finer than most rack-and-pinion focusers. The...

JMI Reverse Crayford 2" Focuser $140.00

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JMI Reverse Crayford 2" Focuser

JMI Reverse Crayford 2" Focuser For all RCF focusers you must specify whether you want a flat or curved base.  For curved bases, you need to specify the radius.  If you don't, you will get the standard size radius. Place a note in the shopping...


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Explore Scientific 127mm APO