ZWO EAF & EAF Pro Electronic Focuser

ZWO

£159.00

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ZWO EAF & EAF Pro — Electronic Automatic Focuser

The latest ZWO EAF range brings precise, repeatable autofocus to your telescope with a robust metal build and minimalist design. Choose the classic EAF for simple, reliable focus control via Type-C, or go cable-light with the EAF Pro, which adds Bluetooth and a built-in battery with physical focus buttons.

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

ZWO EAF / EAF Pro focuser overview

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).
EAF and EAF Pro feature callouts

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.
EAF Pro Bluetooth control

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

EAF Pro integrated control buttons

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).

ASIAIR model identification

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.
EAF bracket and coupling installation

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

Curved focuser mounting example

Mechanical Diagrams

EAF mechanical drawing ZWO EAF mechanical diagram
EAF Pro mechanical drawing ZWO EAF Pro mechanical diagram

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?

ZWO EAF / EAF Pro box contents

Optional Accessories

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

ZWO EAF dedicated accessories overview

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.

EAF Temperature Sensor

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

ZWO EAF & EAF Pro Electronic Focuser

£159.00

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