Viltrox EF-NEX IV Lens Adapter EF/EF-S to Sony E Mount - Fast AF

In this review the Viltrox EF-NEX IV adapter is assessed as an affordable solution for photographers and videographers who want to use Canon EF or EF-S lenses on Sony E-mount bodies. The single biggest reason to consider it is its updated fourth-generation electronics that enable EXIF transmission and a dual autofocus approach, so users retain aperture control and receive lens data on the camera while attempting autofocus-assisted shooting.

Key Features

• Fourth Generation Upgrade: Improved internal electronics aim to make communication between EF/EF-S lenses and Sony E-mount bodies more reliable for exposure and focus data exchange.
• Dual Auto Focus Modes: PDAF for faster focus acquisition and CDAF for a higher success rate give practical flexibility when shooting stills or video with adapted lenses.
• EXIF Signal Transmission: Gold-plated pins transmit shutter, aperture and ISO information to the camera body so lens metadata is recorded with images.
• Aperture Control and Built-in IS: The adapter contains an aperture motor and an internal stabilization assist to allow aperture changes from the camera and help steady focus.
• Tripod Mounting Option: A 1/4 thread on the adapter bottom lets users mount the adapter and lens combination to a tripod or support to reduce strain on the camera mount.
• USB Firmware Upgrade: Firmware can be updated over USB to expand compatibility with additional camera models or fix issues.

Who It's For

The adapter is best for Sony mirrorless owners who already own Canon EF or EF-S glass and want a low-cost way to use those lenses while keeping aperture control and lens metadata. It suits hobbyists, hybrid shooters and content creators who need a practical cross-mount option without buying new lenses.

It is less suitable for professionals who require guaranteed autofocus performance across all lenses and video AF reliability; some users report mixed results for autofocus speed or fit with certain lenses, so those needing flawless, repeatable AF should test their lens and camera combination before relying on it for critical shoots.

Pros & Cons

Pros

• Enables EF/EF-S lenses on Sony E-mount with EXIF and aperture control, preserving lens data.
• Dual AF modes (PDAF and CDAF) provide a balance of speed and accuracy for different shooting situations.
• Lightweight at about 174g and includes a 1/4 screw thread for support, reducing mount strain.
• USB firmware updates offer future compatibility improvements.

Cons

• Build quality and autofocus results are mixed across users and lens models, so some setups may not achieve reliable AF for video.
• Not all lenses will behave identically; occasional fit or focus-length issues have been reported.

Specifications

Our Verdict

The Viltrox EF-NEX IV adapter is a cost-effective way to bring Canon EF and EF-S lenses to Sony E-mount bodies while keeping aperture control and lens metadata. It offers practical features like dual AF modes and firmware updates that make it attractive for enthusiasts and hybrid shooters, but users should verify AF performance with their specific lenses before relying on it for mission-critical video work.

Frequently Asked Questions

Will this adapter pass lens EXIF and allow aperture control?
Yes. The adapter transmits EXIF data via gold-plated pins and has an internal aperture motor to control aperture from the camera.

Can I mount the adapter on a tripod?
Yes. The adapter includes a 1/4 screw thread on the bottom to mount to a tripod or other support to reduce strain on the camera mount.

Is autofocus reliable for video?
Autofocus performance varies by lens and camera; PDAF and CDAF modes help, but some users report mixed AF results for video, so test your setup first.