Jims Mobile, Inc. (JMI) - Focus Motors

DRO

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.

MotoFocus

NGC

NGF

The Next Generation Focuser (NGF) is a low-profile, friction-drive focuser designed for both the amateur and
professional market. The highly acclaimed Crayford design 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. Add the optional variable-speed Motor and Smart Focus, Digital
Read Out (DRO), or Digital Focus Counter (DFC), for the ultimate focusing system. The NGF is truly a
masterpiece of engineering and workmanship that you will be proud to own for years to come. (U.S. Patent No.
5,303,090)

The NGF-S and NGF-miniS are specifically designed for the Schmidt-Cassegrain Telescope (SCT). SCTs achieve
focus by moving the mirror. This design tends to create image shift which is especially problematic for CCD
imaging. The NGF-S and NGF-miniS achieve focus by moving the eyepiece, camera or other equipment at the back
of the telescope instead of the mirror.

NGF3

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 an SCT threaded output adapter to allow use of standard
SCT equipment. The Newtonian version includes a removable 10″ radius curved base (or optional flat
base). The manual version of the NGF-XT lifts up to 12 pounds and the motorized version up to 18 pounds.
Manual ″Nano Drive″ control is approximately 13 times finer than most rack-and-pinion 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)

Other Jims Mobile, Inc. (JMI) Focus Motors