E-Mount AF Lens Adapter EF-NEX IV for Canon EF to Sony E-mount - AF

In this review of the EF-NEX IV electronic adapter the bottom line is simple: it is a practical bridge for photographers who want to mount Canon EOS EF or EF-S lenses on Sony E-mount bodies while retaining autofocus and image stabilization in many situations. The adapter is aimed at hobbyists and hybrid shooters who own useful glass from Canon systems and want to expand lens options on cameras like the A7 series or A6000 series without buying a second lens collection. It performs the core task reliably and adds firmware updatability for future fixes.

Key Features

• Wide compatibility: Lets Canon EOS EF and EF-S mount lenses work on Sony E-mount cameras such as A7, A7II, A7III, A7R series and A6000-series bodies, increasing lens choices.
• Autofocus and aperture control: Supports automatic aperture adjustment and fast AF so exposure settings and focus can be controlled from the camera body.
• IS and EXIF transmission: Transmits image stabilizer data and EXIF so stabilized lenses and metadata remain functional on the camera side.
• Dual AF modes: Offers both PDAF and CDAF modes to match different camera focusing systems, with a simple switch between modes.
• Firmware upgradable: Includes a micro USB port to update firmware and fix compatibility issues without replacing the adapter.
• Durable finish and low weight: Lightweight at about 174g and treated with an electroplated surface to resist wear and reduce internal reflections.

Who It's For

This adapter is best for Canon lens owners who use Sony E-mount bodies such as A7, A7R, A7S, A9 and the A6000 family and want to reuse existing lenses with electronic control and stabilization where supported. It suits photographers who value flexibility and those on a budget who prefer consolidating gear instead of buying duplicates.

Those who rely on flawless, fast autofocus in every shooting scenario - for example professional sports or high-speed action videography - should test their specific lens and camera combination before committing, since AF behavior varies between lens models and some users report inconsistent fit and focusing performance in certain pairings.

Pros & Cons

Pros

• Provides electronic aperture control and transmits EXIF and IS for many Canon lenses, keeping camera-side controls intact.
• Supports both PDAF and CDAF autofocus modes to improve compatibility across Sony bodies.
• Firmware update port allows fixes and compatibility improvements without replacing the adapter.
• Lightweight design and gold-plated pins improve signal transmission and reduce handling fatigue.

Cons

• Autofocus performance and mechanical fit are mixed across users and lens models, so results can vary depending on the lens used.
• AF is unavailable when shooting video with some setups, limiting hybrid video work in certain modes.

Specifications

Mount compatibility	Canon EOS EF/EF-S to Sony E-mount
Supported cameras	Sony A7, A7II, A7III, A7R, A7RII, A7RIII, A7S, A7SII, A9, NEX7, A5100, A6000, A6300, A6500
Autofocus	PDAF and CDAF support (AF unavailable in some video modes)
IS & EXIF	Supports lens image stabilizer and EXIF transmission
Weight	Approx. 174g / 6.14oz
Firmware	Micro USB port for firmware upgrade
Construction	Electroplated surface, gold-plated copper pins

Our Verdict

The EF-NEX IV adapter is a sensible, value-oriented tool for photographers who want to use Canon EF/EF-S lenses on Sony E-mount bodies with retained aperture control, IS and metadata. It is especially good value for hobbyists and those consolidating gear, but prospective buyers should verify AF behavior with their specific lens and camera combination because fit and focusing can be mixed.

Frequently Asked Questions

Will it keep autofocus with my Canon lens?
Answer. The adapter supports PDAF and CDAF so many lenses will autofocus, but performance varies by lens and camera and should be tested for your combination.

Does image stabilization work through the adapter?
Answer. Yes, the adapter transmits IS signals for lenses with built-in stabilization so stabilization can remain active on supported camera bodies.

Can firmware be updated if issues appear?
Answer. Yes, there is a micro USB port to apply firmware updates to improve compatibility and fix bugs.