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Used Telescopes Buyback

ZWO Advanced Electronic Automatic Focuser - EAF-A

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The ZWO Advanced Electronic Automatic Focuser has been discontinued and replaced by the ZWO Advanced Electronic Automatic Focuser - 5V USB Version w/ Hand Controller and Sensor. If you'd like some advice on choosing the best focuser or other accessories to meet your needs, please don't hesitate to call us at 1-800-266-9590 or send an email. We are happy to help!

ZWO Advanced Electronic Automatic Focuser (EAF)

This fantastic ZWO Astronomy Cameras product is changing the game when it comes to achieving that perfect focus for astrophotography. This tool is an electronic focuser that enables precise and dynamic focus control during sessions of planetary and deep-sky imaging.

One of the highlights of the Advanced EAF is it works with all capture software that is supported by the ASCOM platform. This can be added to the ASIAIR WiFi imaging and control system (sold separately) to complete the system and allow users to run their entire imaging sessions with a smartphone or tablet and can do so indoors, if they choose.

Body Design

The body of the EAF was designed in the image of the changing Airy diffraction pattern through a range of focus. It is made with an all-metal, red housing unit. This means it matches the ZWO astronomy cameras. The body includes a 12V DC 5.5mm x 2.1mm, center positive power port and a USB2.0 data port.

Advanced Version

The advanced version of the EAF has the EAF body, flexible coupling, a motor bracket, a USB2.0 cable, a hand controller, and a temperature sensor. This fantastic setup is sure to make focusing a breeze!


The EAF is compatible with the following focusers:

  • Sky-Watcher Astrophotography Reflectors
  • Sky-Watcher Black Diamond
  • Sky-Watcher Dobsonians
  • Sky-Watcher Maksutov-Newtonians
  • SharpStar telescopes
  • SkyRover telescopes
  • TS Optics
  • Astro Tech
  • FeatherTouch Focusers
  • More will be compatible with the EAF in the future, such as Takahashi telescopes and GSO telescopes.


  • Size: 60mm x 50mm x 40mm
  • Motor: Step Motor: 5,760 steps to rotate the circle
  • Power Port: 12V DC 5.5mm x 2.1mm, center positive
  • Data Port: USB2.0 port
  • Weight: 277g.
  • Capacity: 5kg
  • Material: All-metal
  • Color: Red