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 (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 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

Buy Now

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...


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Explore Scientific 127mm APO