CNC-Machined in the USA
Event Horizon EVRZ — ZWO EAF Crayford Focuser, Cassegrain Base
A precision Crayford focuser that mounts your ZWO EAF focus motor and threads onto the rear of your Schmidt-Cassegrain. We supply the focuser mechanics — you supply your own ZWO EAF motor — for true zero-backlash, zero-image-shift autofocus.
Watch: a walkthrough of the Event Horizon EVRZ focuser and how the ZWO EAF mounts to it.
Bolting a ZWO EAF onto your SCT's stock focusing system just motorizes the mirror flop — the backlash and image shift are still there. The EVRZ fixes that: it gives you a true friction-drive Crayford base, and your motor mounts to it with two screws using the couplers already included with your ZWO EAF kit. Now your autofocus routine drives a mechanism that actually holds focus.
Specifications
- ✓ Control focus from ASIAIR and ASCOM interfaces
- ✓ Autofocus with ASIAIR, NINA, Sequence Generator Pro, and other popular software
- ✓ 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 EVRZ 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
You provide the motor. The EVRZ ships as the focuser mechanics with the ZWO EAF mounting adaptation. It does not include the ZWO EAF motor itself.
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. A T-adapter holds a camera more securely than a standard 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. Drops into 2″ eyepiece holders and 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 for precise centering. 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. Have a Newtonian instead? See our Newtonian Focusers.
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