ZWO EAF vs. EAF Pro: A Complete Review of Two Popular Electronic Focusers
Electronic focusers are becoming must-haves in astrophotography, and ZWO has carved out a reputation with two standout options: the ZWO EAF (Electronic Automatic Focuser) and the EAF Pro. These devices remove the guesswork and finger-fiddling from your focusing routine, delivering precise, repeatable results—critical for sharp stars and hands-off imaging.
In this guide, I’ll break down the differences between the two, explain key features, offer real-world insights, and help you decide which is right for your rig.
What is the ZWO EAF?
The ZWO EAF is a compact stepper-motor focuser that attaches to your telescope’s focuser knob. It allows motorized focusing via software or an optional manual controller—no more nudging focus by hand during long-exposure astrophotography. There is a newer version of the original EAF called the EAFN. Notably the EAFN has a USB-C connection instead of USB-B.
Key Features:
- Compatibility: Works with most refractors, Newtonians, and SCT focusers (Celestron, Sky-Watcher, William Optics, etc.).
- Software Support: Compatible with ASCOM (Windows) and INDI (Mac/Linux), and widely supported in automation software like NINA, APT, and ZWO ASIAIR Plus RK Version (other versions not compatible at this time).
- USB-C connection (older EAF versions had USB-B)
- Installation: Plug-and-play for many setups; adapters and mounting templates are widely available.
- Price $199
What is new in the ZWO EAF Pro?
The EAF Pro is a feature-rich upgrade designed for more demanding astrophotography setups. It builds on the same core functionality as the standard EAF but adds several important improvements:
- Built-in 2500 mA battery
- Wireless Bluetooth connectivity (Wi-Fi control from phone/tablet)
- Manual in-out buttons
- Power switch and indicator light
- Same 5 kg capacity
- Price $299
Key Differences: EAF vs. EAF Pro
*Celestron and Takahashi SCT users need to check for full compatibility with the new models. As of the time of this writing, the new model’s coupling may not work with previous adapters.
Final Thoughts: Which EAF Wins?
ZWO has made electronic focusing accessible and effective for everyone. The EAF is great for beginners and casual astrophotographers, while the EAF Pro adds the muscle and automation that experienced users crave. Both are well-supported, well-made, and ready to improve your imaging workflow.
My Verdict:
- Go with the EAF if you’re starting out or have a more modest budget (I have one and it works great).
- Choose the EAF Pro if you value total automation, remote imaging (internal battery is great), wireless connectivity and have a larger budget.
