CNC-Machined in the USA
Event Horizon EVRP — Pegasus FocusCube 3 Crayford Focuser, Cassegrain Base
A precision Crayford focuser that mounts your Pegasus FocusCube 3 focus motor and threads onto the rear of your Schmidt-Cassegrain. We supply the focuser mechanics — you supply your own Pegasus motor — for true zero-backlash, zero-image-shift autofocus.
Bolting a Pegasus FocusCube onto your SCT’s stock focusing system just motorizes the mirror flop — the backlash and image shift are still there. The EVRP fixes that: it gives you a true friction-drive Crayford base, and your motor mounts to it with screws using the couplers already included with your Pegasus kit. Now your autofocus routine drives a mechanism that actually holds focus.
Specifications
- ✓ Control focus from Pegasus software and ASCOM interfaces
- ✓ Autofocus with 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 EVRP for the critical final adjustment
- ✓ Calibrated resolution: 2.63 µm of drawtube travel per Pegasus FocusCube 3 motor step
- ✓ 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 EVRP ships as the focuser mechanics with the Pegasus FocusCube 3 mounting adaptation. It does not include the Pegasus FocusCube 3 motor itself.
What step size should your autofocus routine use? This focuser is calibrated at 2.63 µm per motor step. Use our free Autofocus Step-Size Calculator — pick your telescope and camera and it returns the exact step size for NINA, Sequence Generator Pro, Ekos and more, with this focuser's calibration already loaded.
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. Have a Newtonian instead? See our Newtonian Focusers.
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