CNC-Machined in the USA
Event Horizon EV1 — Dual-Speed Crayford Focuser, Cassegrain Base
Our flagship manual focuser. A dual-speed Crayford drive with a 10:1 fine-focus knob for the most precise adjustments possible by hand — threads onto the rear of your SCT for true zero-backlash, zero-image-shift focus.
A masterpiece of engineering and workmanship, the EV1 is a low-profile, friction-drive Crayford focuser for the discriminating astronomer. The Crayford design presses a metal drive shaft directly against a machined metal drawtube held by bearings on the opposing side — a direct surface-to-surface drive that eliminates the backlash and drawtube shift of rack-and-pinion designs and allows impossibly fine adjustments. Zero image shift and zero backlash make it superb for both visual use and imaging.
Specifications
- ✓ Dual-speed drive with 10:1 fine-focus knob
- ✓ Rubber grip knobs and a compression ring for secure, mar-free holding of eyepieces and cameras
- ✓ Zero image shift, zero backlash — CNC-machined friction-drive Crayford design
- ✓ Threads to the standard SCT rear port — fits Cassegrain, R-C, and Maksutov scopes with standard SCT rear threads
- ✓ 0.565″ (14.3 mm) of fine-focus travel — use the scope's focuser for rough focus, the EV1 for the critical final adjustment
- ✓ Load capacity 8 lb · focuser weight 1.4 lb
- ✓ Individually assembled and tested in our own facility — 100% made in the USA
Optional Optical Adapters
- JMI Combination 1.25″ Eyepiece & T-Thread Adapter (ADPT2-1.25T) — for camera use. Mounts a CCD or other T-threaded camera into a 2″ drawtube, and doubles as a 1.25″ adapter. Uses a compression ring and includes 48 mm filter threads on the focuser end.
- Lumicon 2″ Male – SCT Male Adapter (LA1060) — to attach SCT-threaded accessories. Presents male SCT threads (2″ × 24 tpi) for accessory attachment such as an SCT diagonal. Includes 2″/48 mm filter threads.
- Farpoint 2″ Focuser to 1.25″ Eyepiece Adapter (FAV100) — a visual 2″-to-1.25″ eyepiece adapter with a non-marring compression ring. Threaded for both 2″ and 1.25″ filters, with a stop to keep long eyepieces from damaging filters.
New to Crayford focusers? Read the Event Horizon Focusers guide. Want autofocus? See the motor-ready EVRZ and EVRP versions. Have a Newtonian instead? See our Newtonian Focusers.
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