Hands-on Review: No Cables, No Hassle — But Does It Work?

Why EAF?

• Micron-level accuracy: Custom stepper motor with 1:128 reduction for ultra-fine steps.
• Serious payload: Up to 5 kg (11.02 lb) tested in ZWO Lab.
• Type-C everywhere: Power and data via modern USB-C (EAF & EAF Pro).

What’s special about EAF Pro?

• Built-in lithium battery: true wireless focusing.
• Bluetooth 5.0: pairs with ASIAIR, ASIStudio and ASCOM (via Alpaca).
• On-body focus buttons: nudge focus even after installation.

Battery endurance: ZWO lab testing (room temperature, 2 focus moves/hour, 8 hrs per night) achieved stable operation for 7 consecutive nights.

Software & App Support

Compatible with ASIAIR App, ASIStudio, and major desktop apps via ASCOM or INDI (SharpCap, FireCapture, Maxim DL, TheSkyX, SGP, Nebulosity, FocusMax and more).

ASIAIR compatibility note

Compatible: ASIAIR Plus (RK version) and the full ASIAIR camera lineup.

Not compatible: ASIAIR (1st-gen Raspberry Pi 4), ASIAIR Pro, ASIAIR Mini, ASIAIR Plus (CM4 version).

How to tell: If the device IC suffix is ASIAIRPLUS it’s RK (compatible). If it’s RPICM4 it’s CM4 (not compatible).

Installation — Quick Guide

1. Remove the coarse focus knob from your telescope focuser.
2. Fit the supplied coupling to the focuser shaft and tighten the locking screw.
3. Attach the EAF body, align the flat on the motor shaft with the coupling screw, then tighten.
4. Bolt the EAF bracket to the focuser’s mounting points (keep faces parallel and flush).
5. Check all fixings are secure — done.

Curved focusers (example shown): use the original locking screws plus three washers; the EAF bracket’s underside groove allows a single-screw secure mount.

Mechanical Diagrams

EAF mechanical drawing

EAF Pro mechanical drawing

Takahashi / C8 / C11 owners: use the 4 mm flexible coupling (the newer EAF/EAF Pro are not fully compatible with the older 5 mm coupler).

What’s in the Box?

Optional Accessories

Explore dedicated brackets and add-ons for popular OTAs, plus the hand controller and temperature probe.

EAF-HC Hand Controller

Ergonomic ABS build with two-speed control and 1.5 m cable. Smooth manual focusing without a PC or phone (minimises vibrations during adjustment).

EAF-Sensor Temperature Probe

Feeds real-time ambient temperature to maintain optimal focus during thermal changes. 3.5 mm connector; 100 cm cable.

Available brackets: EAF-BRK-TK, EAF-C8-C925 (Celestron C8/C9.25), EAF-C11-C14 (Celestron C11/C14)