ZWO EAF N Electronic Automatic Focuser The ZWO EAF N drives a telescope focuser with a compact stepper motor and 1:128 reduction. ZWO specifies a 5 kg payload and approximately 2.812 µm positioning per step under its stated setup; linear movement depends on the focuser mechanism.
Manufacturer model: ZWO EAF N Electronic Automatic Focuser · Specifications checked against manufacturer data on 2026-11-03
The ZWO EAF N drives a telescope focuser with a compact stepper motor and 1:128 reduction. ZWO specifies a 5 kg payload and approximately 2.812 µm positioning per step under its stated setup; linear movement depends on the focuser mechanism.
Power and control
A USB Type-C connection supplies 5 V at 500 mA and carries wired control. This model has no integrated battery or Bluetooth. The increased motor power requirement means the original ASIAIR and ASIAIR Pro are not supported by ZWO’s stated USB compatibility guidance.
Software and accessories
The focuser supports ASIAIR, ASIStudio, ASCOM and INDI-compatible workflows. The 3.5 mm accessory connection accepts a compatible hand controller or temperature probe, available separately.
Compatibility and installation
Fit the correct bracket and flexible coupling to the focuser shaft. ZWO advises a 4 mm coupling for the listed Takahashi and Celestron C8/C11 configurations, rather than the 5 mm coupling. Set backlash, zero and travel limits before automated use.
Use the exact named-model manufacturer connection and operating instructions linked with this product. Optional parts and adapters require their specified spacing and power limits.
Additional specifications
Step angle (°)
7.5
Reduction ratio
1:128
Manufacturer step resolution
Approximately 2.812 µm per step; depends on focuser installation
Communication
USB Type-C
USB power
5 V, 500 mA
Accessory port
3.5 mm temperature-probe / hand-controller interface
Coupling note
Takahashi and Celestron C8/C11 installations: use 4 mm coupling; manufacturer advises against 5 mm coupling
Asiair power compatibility
Not compatible with first-generation ASIAIR or ASIAIR Pro USB output capability; manufacturer recommends newer-generation ASIAIR
86542
Data sheet
Dimensions (mm)
41 × 52 × 70.3
Motor
Stepper motor
Mounting
Appropriate bracket and flexible coupling required
Payload (kg)
5
Software
ASIAIR app; ASIStudio; ASCOM; INDI and compatible software
Weight (g)
215
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ZWO EAF N Electronic Automatic Focuser The ZWO EAF N drives a telescope focuser with a compact stepper motor and 1:128 reduction. ZWO specifies a 5 kg payload and approximately 2.812 µm positioning per step under its stated setup; linear movement depends on the focuser mechanism.
Manufacturer model: ZWO EAF N Electronic Automatic Focuser · Specifications checked against manufacturer data on 2026-11-03
