Event Horizon Focusers

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.  The modular design makes
changes and upgrades extremely easy to accomplish.  Add the optional variable-speed Motor and Smart
Focus or Digital Readout (DRO) for the ultimate focusing system.  The EV is truly a masterpiece of
engineering and workmanship that you will be proud to own for years to come.

Next Generation 1.25 inch Crayford Focusers

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 Telescopes (NGF-XTn).
 The Cassegrain version includes a 2" Eyepiece Adapter.  The Newtonian version includes a removable
combination base (works on 10" radius up to a flat surface).  The manual version of the NGF-XT lifts up
to 8+ pounds and the motorized version up to 18 pounds.  Manual "Nano Drive" control is approximately 13
times finer than most rack-and-pinion focusers.  Regular motorized versions include a standard hand
unit.

Next Generation 3 inch Crayford Focusers

RCF

The Reverse Crayford Focuser (RCF) is a light-weight, low-profile focuser with a new revolutionary
design - JMI′s low-cost, high-quality answer to plastic focusers. The reverse Crayford design
gives zero image shift and zero backlash. (U.S. Patent No. 6,297,917)

Feather Touch Focusers

Micro Pinion Assembly