ZWO Electronic Automatic Focuser EAF-N

Precise motorized focusing for demanding astrophotography

The ZWO EAF-N automates telescope focusing and provides precise, repeatable focus control. Its powerful stepper motor and 1:128 reduction gearing move the focuser smoothly and accurately, making it ideal for long imaging sessions, filter changes and automated astrophotography setups.

A modern USB-C connection handles both power and data through a single cable. The EAF-N works with the ZWO ASIAIR App, ASIStudio and a wide range of ASCOM- and INDI-compatible applications. Depending on the imaging software used, it can perform fully automated autofocus routines.

Despite its compact 215 g metal housing, the EAF-N supports loads of up to 5 kg according to ZWO, making it suitable for demanding camera and accessory configurations.

Key features

• Precise and repeatable telescope focusing
• High-quality stepper motor with 1:128 reduction gearing
• Positioning resolution of approximately 2.812 µm per step
• Load capacity of up to 5 kg
• USB-C connection for power and data
• Compatible with the ASIAIR App and ASIStudio
• ASCOM and INDI support
• Optional hand controller and temperature sensor available
• Compact and durable metal housing
• Ideal for automated deep-sky and planetary imaging

Technical specifications

• Product: ZWO Electronic Automatic Focuser EAF-N
• Motor: Stepper motor
• Motor step angle: 7.5°
• Reduction ratio: 1:128
• Resolution: Approximately 2.812 µm per step
• Maximum payload: 5 kg
• Connection and communication: USB Type-C
• Power supply: USB Type-C, 5 V / 500 mA
• Dimensions: 41 × 52 × 70.3 mm
• Weight: 215 g
• Software support: ASIAIR App, ASIStudio, ASCOM and INDI
• Port for optional hand controller or temperature sensor: Yes
• Bluetooth and built-in battery: No

Important compatibility information

Due to its increased power requirements, ZWO states that the EAF-N is not compatible with the first-generation ASIAIR or the ASIAIR Pro. For Takahashi, Celestron C8 and C11 telescopes, ZWO recommends using a 4 mm flexible coupling because the new EAF generation is not fully compatible with the 5 mm coupling.