ZWO EAF Pro Review by The Space Koala:
No Cables, No Hassle — But Does It Really Work?

Precision Focusing at Your Fingertips

The new generation of ZWO EAF continues the brand’s signature minimalist design, featuring a robust metal housing and precise angular lines — a perfect fusion of form and function. Available in two versions: EAF and EAF Pro — to suit different user needs.

EAF features a more universal Type-C interface for broad compatibility and easy installation.

EAF Pro comes with a built-in battery and Bluetooth connectivity, reducing power supply constraints. It also includes manual focus buttons, allowing direct adjustment even after installation — offering maximum flexibility and convenience. Both models deliver a more user-friendly focusing experience, achieving pinpoint focusing accuracy for breathtaking cosmic imagery.

Compatibility Notice:

Due to the increased torque of the new EAF motor, higher power input is required. This exceeds the USB output capability of earlier ASIAIR, making it incompatible with the first-generation ASIAIR and the second-generation ASIAIR Pro. For stable operation, it is recommended to use the new-generation ASIAIR.

Unique Advantages of the EAF Pro

1. Upgraded Universal Type-C Interface

2. Micron-Level Precision Focusing

3. 5 kg（11.02lbs） High Load Capacity

4. EAF Pro with Built-in Focus Adjustment Knob

5. Bluetooth Connectivity (EAF Pro)

6. Built-in Battery Power Supply (EAF Pro)

EAF

Micron-level Positioning Accuracy

The ZWO EAF integrates a high-precision custom stepper motor with compact yet powerful performance. Featuring a 1:128 reduction ratio, it provides the motor with strong torque and precise control capabilities, achieving micron-level positioning accuracy. Each rotation responds precisely to commands, ensuring accurate and reliable focusing.

EAF

5kg（11.02lbs） High Load Capacity

Astronomical observation equipment often requires the use of various heavy components. The ZWO EAF, despite its compact size, can support a high load capacity of up to 5kg（11.02lbs）, as rigorously tested in ZWO Laboratory. Its powerful performance ensures stable operation of a wide range of equipment, meeting diverse observation needs.

EAF

More Universal Type-C Interface

The EAF is an upgrade from the previous version, with its interface upgraded from Type-B to the more universal Type-C. Users can power the EAF directly via a Type-C connection to a camera, computer, or ASlAlR, it also supports wired communication via a Type-C interface. Simplifying cable management and reducing power load.

EAF Pro

Wireless Bluetooth Control

The EAF Pro features a built-in low-power Bluetooth 5.0 chip, enabling wireless connectivity with ASIAIR and smart cameras. It is fully compatible with ASIAIR APP, ASIStudio, and ASCOM platform software — offering flexible and cable-free focus control.

When used with ASIAIR, the EAF Pro is compatible with the ASIAIR Plus (RK version) and the entire ASIAIR camera lineup. It is not compatible with the following models:

ASIAIR (1st generation, Raspberry Pi 4)

ASIAIR Pro

ASIAIR Mini

ASIAIR Plus (CM4 version)*

*Note: There are two versions of the ASIAIR Plus. You can identify the version by the IC number on the device:

Suffix “ASIAIRPLUS” indicates the RK version (compatible)

Suffix “RPICM4” indicates the CM4 version (not compatible)

EAF Pro

Built-in Lithium Battery

Powered by an integrated lithium battery, the EAF Pro frees you from external power constraints and enables truly wireless operation. It offers greater flexibility and ease of use to meet diverse needs.

One-Week Endurance
*Tested under standard conditions in the ZWO lab at room temperature. The device performed 2 focusing operations per hour, with each test session lasting 8 hours per night. Under these conditions, it was able to run stably for 7 consecutive nights.

EAF Pro

Integrated Focusing Button

The EAF Pro features integrated focusing buttons on its body, allowing users to make quick and precise adjustments even after installation. This design greatly enhances usability and flexibility, enabling seamless focusing across a variety of observing and imaging scenarios.

Extensive Software Support

EAF supports both ASCOM and INDI protocols, making it compatible with a wide range of astrophotography software, including:
ZWO-developed platforms: ASIStudio and ASIAIR APP
Third-party software: SharpCap, FireCapture, Maxim DL, The SkyX, SGP, Nebulosity, and more. Also compatible with third-party focusing software such as FocusMax

For information on which ASIAIR models are compatible with this product, please contact customer support for details.

Support handle controller and manual focusing

The EAF hand controller is made of high-quality, eco-friendly ABS material to ensure a comfortable grip. The hand controller provides an easy method of focusing the telescope, featuring IN and OUT buttons, allowing for smooth manual focusing without relying on a computer or smartphone. This design also minimizes subtle vibrations during operation, helping to maintain precise focus. A “must-have” option for EAF users!

Connection

1. Remove the coarse adjustment knob of the telescope focuser using a suitable sized wrench.

2. Install the coupling on the telescope focuser shaft and tighten the locking screw with the 2mm hex wrench.

3. Attach the focuser body to the coupling, align the EAF motor shaft flat surface with the locking screw, and tighten the locking screw using the provided 2mm hex wrench.

4. Secure the EAF body to the bracket and the bracket to the matching mounting holes in the focuser assembly using the supplied M4 screws. Ensure that the bracket is flush with the EAF mounting surface without any gaps, and that it is parallel to the focuser body surface.

5. Check and ensure that all the connections of the EAF are secure. This completes the hardware installation of the EAF.

6. For curved focusers like the one in the image above, you only need to use the original locking screws and 3 washers to secure the EAF. There is a groove at the bottom of the EAF bracket, and a single screw provides sufficient stability.

Mechanical Diagram

EAF

EAF Pro

For users of Takahashi, C8, and C11 telescopes:
The new EAF and EAF Pro is not fully compatible with the 5mm flexible coupling. We strongly recommend using the 4mm flexible coupling for proper installation.

What's in the box？

Optional Accessories

Click here to learn more about EAFN/EAF Pro accessories.

Available Models:
EAF-BRK-TK
EAF-C8-C925 (for Celestron C8/C9.25)
EAF-C11-C14 (for Celestron C11/C14)
EAF-HC — Hand Controller for EAF
EAF-Sensor — Temperature Sensor for EAF

EAF-HC Hand Controller

Designed exclusively for the ZWO Electronic Automatic Focuser (EAF), this handheld controller features an ergonomic design with durable ABS construction, offering a comfortable grip and secure connection.

Equipped with a two-speed control switch, it allows for precise manual focusing—from fine adjustments to rapid focus moves—with ease and accuracy.

The 1.5-meter cable provides flexible usage, and the standard 4-pin 3.5mm audio jack ensures quick and reliable connection, enhancing operational convenience.

The EAF Hand Controller is your essential companion for astrophotography focusing.

EAF-Sensor Temperature Probe

Specifically designed for the ZWO Electronic Automatic Focuser (EAF), this temperature probe accurately monitors subtle changes in ambient temperature. By providing real-time temperature data, it works in tandem with the focuser to ensure your telescope maintains optimal focus under varying thermal conditions.

Connector Diameter: 3.5mm
Cable Length: 100cm

ZWO EAF Pro Review by The Space Koala:No Cables, No Hassle — But Does It Really Work?

Precision Focusing at Your Fingertips

Unique Advantages of the EAF Pro

EAF

Micron-level Positioning Accuracy

EAF

5kg（11.02lbs） High Load Capacity

EAF

More Universal Type-C Interface

EAF Pro

Wireless Bluetooth Control

EAF Pro

Built-in Lithium Battery

EAF Pro

Integrated Focusing Button

Extensive Software Support

Support handle controller and manual focusing

Connection

Mechanical Diagram

EAF

EAF Pro

What's in the box？

Optional Accessories

EAF-Sensor Temperature Probe

ZWO EAF Pro Review by The Space Koala:
No Cables, No Hassle — But Does It Really Work?

Electronic Focuser

EAF/EAF Pro