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

MOTOFOCUS is an electric focus motor for precise, vibration-free focusing without the need to touch the
telescope. It is great for visual and photographic use and features variable speed for coarse and fine
adjustment. Precise positioning is accomplished through electronic braking.  Mounting is easy with no
drilling or tapping. Add the optional Digital Read Out (DRO), or Digital Focus Counter (DFC), for
improved focusing accuracy and repeatability. (U.S. Patent No. Des. 286,6444)

NGC

Our popular computers allow you to easily guide to hundreds, thousands or even millions of objects in
the database without knowing where they are and without using a star chart. You don′t even need to
level or polar align your scope. You can spend more time observing and less time hunting for objects.
These computers are sometimes called digital setting circles because the early versions only displayed
right ascension and declination, thus replacing the telescopes mechanical setting circles. The Next
Generation Computers (or MAX computers as they are sometimes called) are not ″Go-To″
computers in that they do not move the telescope for you. 

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

Focusmate Driver

For visual or CCD use, focusing a Tele Vue telescope can now be smoother, more accurate and vibration – free when you add the Focusmate plus the new Focusmate Driver (FDR-2001 or FDL-2002). This adjustable speed electric motor drive installs easily onto the Focusmate 6:1 fine focus unit, and offers a unique quick disconnect for switching (without tools) between electric and manual operation.

Other TeleVue Focus Motors