ZWO EAFN Electronic Automatic Focuser

BH #ZWOEAFN • MFR #ZWO EAFN
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ZWO EAFN Electronic Automatic Focuser
Key Features
  • Compatible with Many Imaging OTAs
  • Universal USB-C Interface
  • Micron-Level Precision Focusing
  • Maximum Load Capacity: 11 lb
Updated USB-C connectivity, ultra precise focusing, and support for heavy cameras and accessories mark the EAFN Electronic Automatic Focuser from ZWO. With the ability to focus at the micron level, the EAFN will help you achieve pinpoint stars and tack-sharp planetary images in your astrophotography sessions. Compatible with a wide range of refractor, Newtonian, Cassegrain, and other optical tube assemblies, the EAFN is controlled by a USB-C connection to a computer (or ASIAIR Wi-Fi module) and can support 11 pounds including a camera, filter wheel, off-axis guider, and other accessories. It supports ASCOM and INDI drivers and compatible astrophotography software, naturally including ZWO's ASICAP products. Add the optional, separately sold hand controller and temperature sensor to make the unit even easier to operate.
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ZWO EAF Overview

Updated USB-C connectivity, ultra precise focusing, and support for heavy cameras and accessories mark the EAFN Electronic Automatic Focuser from ZWO. With the ability to focus at the micron level, the EAFN will help you achieve pinpoint stars and tack-sharp planetary images in your astrophotography sessions. Compatible with a wide range of refractor, Newtonian, Cassegrain, and other optical tube assemblies, the EAFN is controlled by a USB-C connection to a computer (or ASIAIR Wi-Fi module) and can support 11 pounds including a camera, filter wheel, off-axis guider, and other accessories. It supports ASCOM and INDI drivers and compatible astrophotography software, naturally including ZWO's ASICAP products. Add the optional, separately sold hand controller and temperature sensor to make the unit even easier to operate.

Compatible Telescopes
Select models of the following telescope and focuser brands are compatible with the EAF. Note that additional models will be added.
  • SkyWatcher Astrophotography Reflectors
  • SkyWatcher Black Diamond
  • SkyWatcher Dobsonians
  • SkyWatcher Maksutov-Newtonians
  • SharpStar
  • SkyRover
  • TS Optics
  • Astro Tech
  • Feather Touch

ZWO EAF Specs

Motor
35 mm Stepper Motor, 5760 Steps
Power Supply
5 VDC via USB-C
Load Capacity
11.02 lb / 5 kg
Dimensions
2.0 x 1.6" / 52 x 41 mm
Weight
9.8 oz / 277 g
Packaging Info
Package Weight
1.19 lb
Box Dimensions (LxWxH)
7.2 x 7 x 2.7"

ZWO EAF Reviews

Works as expected

By Michael
Rated 3 out of 5
Date: 2026-05-03

Works well. A little loud when running, but who hears it in the yard? Noticeable backlash--make sure you have your NINA backlash set and this is no issue. Had to print a bracket for it on my refractor, but that was expected.

Improper Wire Routing

By James
Rated 1 out of 5
Date: 2025-07-15

Purchased an older unit a year or so ago, and worked great for about 6 months. Motor started hesitating, losing RPM as well when operating in either direction, Pulled the motor from the housing and the wiring was so short it had to be pressed against the housing. The wires were not long enough to to route them underneath the motor where there was plenty of space. The wires were so tightly compressed to the motor it pulled the wires away from the motor contributing to a bad connection. The unit ran just fine outside the case when holding the wires away from the motor. Push them back against the motor and motor operated sporadically. Reinstalled motor, same issue. Not Impressed.

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