JMI - NGF-XTC

JMI - Model NGFXTC  Crayford Focuser w/o Motor (Cassegrain scopes)

The Next Generation Focuser (NGF) is a low-profile, friction-drive focuser designed for both the amateur and professional .  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.

The NGF-XTc is specifically designed for Cassegrain telescopes (10" to 16").  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.

The NGF 3" focusers include a compression ring in the drawtube for holding eyepieces and accessories without scratching the equipment.  The adjusting screw presses against the ring which tightens around the eyepiece or accessory.

 

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.