JMI  EV-1c Dual-Speed Event Horizon Telescope Focuser - Cassegrain

Comes with no optical adapters so that you can select the optional adapter(s) you need, if any.   

Select JMI Combination 1.25-inch Eyepiece and T-Thread Adapter, ADPT2-1.25T for camera use. JMI Adapter for mounting a CCD or other camera, with a standard T-thread, into a 2" drawtube. It also doubles as a 1.25" adapter. A T-adapter holds a CCD camera more securely than a standard 1.25" adapter. The adapter uses a compression ring to secure inserted equipment. It includes standard 48mm filter threads on the other end of the adapter (inserted into focuser end).

Select Lumicon 2 Inch Male - SCT Male Adapter, LA1060 to attach SCT threaded accessories. Lumicon 2 Inch Male - SCT Male Adapter drops into 2″ telescope eyepiece holders and presents male SCT threads (2″ x 24 tpi) for Schmidt-Cassegrain telescope accessory attachment (SCT diagonal, for example). Includes 2″/48mm filter threads.

Select Farpoint 2 Inch Focuser to 1.25 Inch Eyepiece Adapter, FAV100 for a visual 2" to 1.25" eyepiece adapter. Farpoint 2 Inch Focuser to 1.25 Inch Eyepiece Adapter features a non-marring compression ring for precise centering of telescope eyepieces. Threaded for both 2 inch and 1.25 inch filters and has a stop to prevent long eyepieces from damaging filters.

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A masterpiece of engineering and workmanship, JMI EV-1c Dual-Speed Event Horizon Telescope Focuser - Cassegrain is a low-profile, friction-drive focuser designed for both the amateur and professional telescope market.

The highly acclaimed Crayford design uses high pressure on a metal drive shaft pressing against a 2.5"metal drawtube which is held by bearings on the opposing side. This direct surface-to-surface drive mechanism eliminates backlash and shifting of the drawtube as seen in other designs such as the rack-and-pinion focuser, and allows for very fine adjustments. Zero image shift and zero backlash makes this focuser fantastic for visual and photographic work and a must for CCD imaging.

Featuring a 2″ black-anodized aluminum focuser design with dual-speed drive, pusher bearing, rubber grip gold knobs and two-speed operation. The focuser lifts up to 8 pounds and its dual-speed manual controls are over 15 times finer (small outer knob) and 1½ times finer (large inner knob) than most rack-and-pinion focusers, with a 9:1 ratio. Includes a compression ring in the drawtube for holding telescope eyepieces and accessories without scratching the equipment. The adjusting screw presses against the ring which tightens around the eyepiece or accessory. 

Reducing adapters pictured are available separately.

Compatible with 6″ to 16″ Cassegrain telescopes (e.g. SCT and Mak-Cas) with standard output threads (2" x 24 T.P.I).  The focuser gives 1/2″ of travel and is designed for fine focus after rough adjustment with the normal telescope focusing knob.