CNC-Machined in the USA
Event Horizon EVRZ — ZWO EAF Crayford Focuser, Newtonian Base
A precision Crayford focuser that mounts your ZWO EAF focus motor and replaces the stock focuser on your Newtonian. 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 a stock Newtonian focuser just motorizes the backlash and image shift — they’re 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
- ✓ 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 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.
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.
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. Have a Schmidt-Cassegrain instead? See our SCT Focusers.
You may also like
Recently viewed