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JMI - Model XT Cassegrain Focuser without Motor

Model#: NGF-XTc

Discontinued Product

Manufactured by: Jims Mobile, Inc. (JMI)

JMI - Model XT Cassegrain Focuser without Motor

Details

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.

 

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Additional Information

Name JMI - Model XT Cassegrain Focuser without Motor
Manufacturer Jims Mobile, Inc. (JMI)
Model NGF-XTc
Discountinued Yes