ZWO EAF 5V Electronic Automatic Focuser – Precision at Your Fingertips
If you’ve ever struggled with getting that perfect focus during an imaging session, the ZWO EAF 5V Electronic Automatic Focuser is here to change the game. Designed for astrophotographers who demand accuracy and convenience, this motorized focuser eliminates the hassle of manual adjustments and delivers ultra-precise focusing with the touch of a button.
Unlike older models that require an external power supply, this version runs entirely on a standard 5V USB connection, meaning no extra power cables cluttering up your setup. Whether you’re controlling your telescope remotely or just want to eliminate vibrations from manual focusing, the ZWO EAF is an essential upgrade for any serious astrophotographer.
Why Choose the ZWO EAF 5V?
Seamless USB Power Integration
One of the standout features of this model is its USB-powered operation. Traditional motorized focusers often need a separate 12V power source, which adds complexity and potential compatibility issues. The EAF 5V eliminates that hassle by drawing power straight from your computer or imaging hub. Just plug it into your laptop, mini-PC, or ASIAIR device, and you’re ready to go—no extra power brick required.
High-Precision Stepper Motor
Achieving razor-sharp focus is a delicate task, but the high-torque stepper motor in the EAF makes it effortless. With a 12V-rated motor running at 5V, you get smooth and ultra-fine focus control with 5760 steps per full rotation. That means sub-micron precision, making this focuser ideal for deep-sky astrophotography and high-magnification planetary imaging.
Weight and Load Capacity
For those concerned about weight and balance, the ZWO EAF 5V is lightweight, coming in at 277g (9.8 oz). Despite its compact size, it delivers impressive performance, supporting up to 5 kg (11 lbs) of payload, making it suitable for a wide range of telescope focusers, including heavier imaging trains with cameras, filter wheels, and off-axis guiders.
Broad Compatibility with Focusers
The ZWO EAF is designed to work with a variety of telescope focusers right out of the box. It includes mounting brackets that fit most popular models from brands like:
- Astro-Tech
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Sky-Watcher (including the Crayford-style focusers on their Evostar and Esprit series)
- William Optics
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Celestron SCTs and RASA (with an optional bracket)
- GSO and other Crayford-style focusers
If you’re using a refractor, reflector, or Schmidt-Cassegrain, chances are you’ll find a way to mount this motorized unit with minimal effort.
ASCOM and INDI Compatibility
For those running advanced imaging setups, the EAF is fully compatible with ASCOM and INDI drivers, ensuring seamless integration with software like NINA, SGP, APT, and FireCapture. Whether you’re fine-tuning focus through autofocus routines or controlling everything remotely, the ZWO EAF 5V makes the process straightforward and reliable.
Works with ASIAIR for a Complete Wireless Setup
If you’re already using ZWO’s ASIAIR Pro or ASIAIR Plus, the EAF integrates perfectly. Autofocus your telescope wirelessly using your phone or tablet, allowing you to run an imaging session without ever touching your scope. It’s a plug-and-play experience that keeps everything simple, efficient, and free of unnecessary cables.
What’s in the Box?
The ZWO EAF 5V includes everything you need to get started:
✔ ZWO EAF unit
✔ Bracket and hardware for installation
✔ Flexible coupling (to connect the motor to your focuser)
✔ USB 2.0 cable
✔ Hex wrench for mounting adjustments
Optional Accessories:
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Hand Controller – If you prefer manual electronic focusing, ZWO offers a dedicated EAF hand controller for precise adjustments.
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Temperature Sensor – For those needing precise thermal compensation, the ZWO EAF temperature sensorensures your focus remains rock-solid as the night cools down.
Final Thoughts – Is the ZWO EAF 5V Right for You?
If you’re looking for a high-precision, easy-to-install, and USB-powered automatic focuser, the ZWO EAF 5V is an excellent choice. It removes the frustration of manual focusing, integrates seamlessly with popular astrophotography software, and requires no extra power supply. Whether you’re running a backyard observatory or imaging remotely, this focuser will help you capture sharper, more detailed astrophotos with minimal effort.
