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.
|Name||JMI - Model XT Cassegrain Focuser without Motor|
|Manufacturer||Jims Mobile, Inc. (JMI)|