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

Manufactured by: JMI


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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 Newtonian Telescopes (NGF-XTn).  A 2" Eyepiece Adapter is included.  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.

What is a Next Generation Focuser?
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 (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.  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.

The NGF-XTc is specifically designed for Cassegrain telescopes.  The most popular type of Cassegrain telescope is the Schmidt-Cassegrain Telescope (SCT).  These telescopes achieve focus by moving the primary mirror.  This design tends to create image shift which is especially problematic for CCD imaging.  The NGF-XTc achieves focus by moving the eyepiece, camera or other equipment at the back of the telescope instead of the mirror.

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