Brand: ZWO

ZWO EAF 5V Electronic Automatic Focuser (ZWO-EAF-5V)


Brand: ZWO

ZWO EAF 5V Electronic Automatic Focuser (ZWO-EAF-5V)


The ZWO electronic auto focuser (EAF) is sure to improve your astrophotography sessions with pin-point stars. It's a great little package that can be installed on virtually any telescope.
  • Highly integrated design
  • Support ASCOM platform and various ASCOM-compatible third-party software
  • Support INDI
  • Support original software such as ASIAIR and ASIStudio
  • Support automatic focusing for DSO imaging
  • Support handle controller and manual focusing
  • Support temperature sensor
  • USB HID device and driver-free
  • Stable and durable
$269.00 CAD

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$269.00 CAD

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Why we love the ZWO EAF 5V Electronic Automatic Focuser (ZWO-EAF-5V)

The 5V EAF (ZWO-5V-EAF) automatically focusses your telescope for planetary and deep-sky imaging, while only connected to a 5V USB-port.  The EAF has several accessories available for it including a temperature sensor, a hand controller, and adapters for a number of optical tubes.  The EAF works seamlessly with other ZWO products, the ASIAIR will even allow you to control it with your phone.  These are a great device for new and experienced astrophotographers.  

Recommended Accessories

The EAF has a few accessories available for it.  The three that we really like pairing it with are:

1. The EAF Hand Controller will allow you to remotely adjust the focus of your telescope.

2. The Temperature Sensor for the ZWO EAF lets you automatically refocus based on changes in temperature. 

3. The ZWO ASIAIR isn't specifically an accessory for the EAF, but it does allow for easy integration and management of the EAF in your imaging system.  

These accessories can help you get the very best out of the ZWO EAF.

Product Description

This is the current version of the EAF. It no longer requires a dedicated 12V power supply. Now you can directly connect it to your camera, laptop or ASIAIR via the USB 2.0 port and use a cable for both data transmission and power supply! This makes the cable management much easier, as well as reducing the need for additional power outlets.

The innovative decorative pattern on the EAF is inspired by the changes of Airy disk during focusing showing how the focusing curve gives a local minimum at best focus – giving an easy explanation on how the EAF works just with a glance on the cover!


  • Size: 59mm x 52mm x 41mm
  • Motor: Step motor, 35mm diameter, 7.5° step angle
  • Reduction ratio: 120
  • Power/Data port: USB2.0 port, Type-B
  • Weight: 277g
  • Capacity: 5kg

Customer Reviews

Based on 40 reviews

Easy install, works extremely well through my ASI AirPlus. Quiet, well made quality addition.
I’m actually considering replacing my Celestron EAF on my C9.25. The ZWO is quieter and easier to use.

Eliminate Focus Guessing

One of the best astrophotography accessory item that takes away the focus guessing game. The more automation the better.

Great automation upgrade for my rig.

This EAF takes the guess work out of focusing. I don't miss the time out in the cold trying to dial in focus at all.

Item arrived quickly and well packaged. Thanks All-Star Telescope.


I am happy I was able to get this before it sold out again. I waited a long time to get this product. Very fast delivery. Very easy to install. This definitely will help be sure I'm focused all night long.


ZWO EAF 5V Electronic Automatic Focuser (ZWO-EAF-5V)

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