1. Introduction
The VILTROX EF-E5 Lens Mount Adapter allows Canon EF/EF-S series lenses to be used on Sony E-mount cameras and NEX series cameras. This adapter facilitates electronic communication between the lens and camera, enabling features such as autofocus, aperture control, and EXIF data transmission. It is designed to expand lens compatibility for Sony E-mount users.
2. Safety Information
- Do not expose the adapter to water or extreme humidity.
- Avoid direct sunlight or high temperatures.
- Handle with care to prevent damage to electronic contacts.
- Keep out of reach of children.
- Do not attempt to disassemble or modify the adapter.
3. Package Contents
Verify that all items are present in the package:
- 1 x VILTROX EF-E5 Lens Mount Adapter
- 1 x Front Cap
- 1 x Rear Cap
- 1 x User Manual

Image: Contents of the VILTROX EF-E5 package, including the adapter, front and rear caps, and user manual.
4. Setup
4.1 Attaching the Adapter to the Camera
- Ensure both the camera and adapter are powered off.
- Align the red dot on the adapter with the red dot on your Sony E-mount camera body.
- Insert the adapter into the camera mount and rotate it clockwise until it clicks into place.

Image: The VILTROX EF-E5 adapter separated from a Sony camera body, illustrating the mounting process.
4.2 Attaching a Canon EF/EF-S Lens to the Adapter
- Align the red dot on your Canon EF/EF-S lens with the red dot on the VILTROX EF-E5 adapter.
- Insert the lens into the adapter and rotate it clockwise until it clicks into place.
- Ensure the lens is securely mounted.

Image: A Canon EF lens fully mounted onto the VILTROX EF-E5 adapter, which is attached to a Sony camera.
5. Operation
5.1 Key Features
- Compatibility: Supports Canon EF/EF-S series lenses on Sony E-mount cameras.
- Dual Focus Mode (PDAF & CDAF): Allows manual switching between Phase Detection Autofocus (PDAF) and Contrast Detection Autofocus (CDAF) for optimal focusing.
- OLED Display: Provides real-time information on focal length, aperture, adapter mode, and manual aperture mode.
- Electronic Contacts: Built-in electronic contacts ensure fast and accurate autofocus, and EXIF signal transmission.
- USB Upgrade Port: Enables firmware updates via a USB connection to a computer.
5.2 Using the OLED Display and Focus Modes
The EF-E5 adapter features an OLED display to show current settings and modes. It also allows for switching between focus modes and manual aperture control.

Image: The VILTROX EF-E5 adapter's OLED display showing focal length and aperture settings.
- Manual Aperture Mode: Press and hold the "+" button for 1 second to enter manual aperture mode. Use the "+" / "-" buttons to adjust the aperture value. Press and hold the "+" button again to exit this mode.
- Object Distance Display Mode: Press and hold the "-" button for 1 second to enter the object distance display mode. The two modes (manual aperture and object distance) can be switched by pressing and holding the respective button for 1 second.
- Focus Mode Switching: The adapter ring can manually switch between PDAF and CDAF modes. Refer to your camera's manual for specific settings related to adapter use.

Image: Illustration of the +/- buttons on the adapter used for switching between manual aperture and object distance display modes.
5.3 Firmware Update
To ensure optimal performance and compatibility, it is recommended to keep the adapter's firmware updated. The EF-E5 features a USB upgrade port.
- Connect the adapter to a computer using a USB cable (not included).
- Visit the official VILTROX website to download the latest firmware for the EF-E5 model.
- Follow the instructions provided with the firmware download to complete the update process.

Image: Detail of the USB port on the VILTROX EF-E5 adapter, used for firmware updates.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the adapter. For electronic contacts, use a clean, lint-free cloth and avoid touching them directly with fingers.
- Storage: When not in use, attach the front and rear caps to the adapter to protect the mounts and electronic contacts from dust and damage. Store in a dry, cool place.
- Avoid Impact: Protect the adapter from drops or impacts, which can damage internal components or deform the mount.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Autofocus is slow or not working. | Outdated firmware, incompatible lens, or camera settings. |
|
| Lens or adapter feels loose. | Improper mounting or manufacturing tolerance. |
|
| Camera battery drains quickly. | Adapter drawing power even when camera is off. |
|
| No electronic communication (aperture control, EXIF). | Dirty or damaged electronic contacts, incompatible lens. |
|
7.1 Lens Compatibility Chart
Refer to the following chart for tested lens compatibility and specific notes regarding video focusing and manual aperture mode.

Image: Detailed compatibility chart for various Canon, Tamron, Sigma, and Tokina lenses with the VILTROX EF-E5 adapter, including notes on video focusing and manual aperture.
8. Specifications
| Model | EF-E5 |
| Compatible Lenses | Canon EF/EF-S series lenses |
| Compatible Cameras | Sony E-mount cameras (e.g., A9, A7 series, a6000 series, NEX series) |
| Focus Mode | Auto Focus (PDAF & CDAF support) |
| Firmware Upgrade | Micro USB Port |
| Dimensions | 83 x 72 x 36.5 mm |
| Item Weight | 10.9 ounces (approx. 309 grams) |
| Tripod Socket | Cu 1/4" x 1 |
9. Warranty and Support
VILTROX products typically come with a limited warranty. Please refer to the warranty card included in your package or visit the official VILTROX website for detailed warranty terms and conditions specific to your region.
For technical support, firmware updates, or service inquiries, please contact VILTROX customer service through their official website or the contact information provided in your product documentation.
Official VILTROX Website: www.viltrox.com





