CNC-Machined in the USA
Event Horizon EV3 — Standard Crayford Focuser, Newtonian Base
The straightforward, no-frills way into true zero-backlash focusing. A single-speed friction-drive Crayford with a compression ring — replaces the stock focuser on your Newtonian for smooth, shift-free fine focus.
A masterpiece of engineering and workmanship, the EV3 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 very fine adjustments. Zero image shift and zero backlash make it superb for both visual use and imaging.
Specifications
- ✓ Single-speed friction drive
- ✓ Compression ring for secure, mar-free holding of eyepieces and cameras
- ✓ Zero image shift, zero backlash — CNC-machined friction-drive Crayford design
- ✓ Drawtube length of travel is configurable at the time of order (see drop-down menu)
- ✓ Compatible with Newtonian telescope tubes 7.25″ in diameter or larger, as well as flat focuser boards
- ✓ Load capacity 4 lb · focuser weight 1.4 lb
- ✓ Individually assembled and tested in our own facility — 100% made in the USA
Fitting note: Fitting a new focuser onto an existing Newtonian takes careful consideration and engineering — it is not a one-size-fits-all swap. Many publicly available tools and active community forums can help you plan the change.
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.
- 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 grip knobs and 8 lb capacity? See the EV2. Have a Schmidt-Cassegrain instead? See our SCT Focusers.
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