1. Introduction
The VILTROX C-AF 2X II Teleplus 2.0X Teleconverter is an optical accessory designed to extend the focal length of compatible Canon EF mount lenses by a factor of 2.0x. This teleconverter maintains autofocus functionality and transmits EXIF information to the camera. It is ideal for photographers seeking to increase the reach of their telephoto lenses for subjects such as wildlife, sports, or distant landscapes.
This manual provides essential information for the proper installation, operation, and care of your VILTROX C-AF 2X II Teleconverter.
2. Product Overview and Features
The VILTROX C-AF 2X II Teleplus 2.0X Teleconverter is engineered with precision optics and robust construction to deliver enhanced magnification while preserving image quality. Key features include:
- 2.0x Magnification Factor: Doubles the focal length of the attached lens.
- Autofocus Support: Maintains the autofocus function of the lens and camera system.
- EXIF Information Transmission: Ensures correct recording of lens data.
- Optical Construction: Features 7 optical glasses arranged in 4 groups with multi-coated surfaces to reduce reflections and improve light transmission.
- USB Firmware Upgrade: Equipped with a USB interface for future firmware updates.
- Durable Design: Weather-resistant construction with anti-reflective internal components.
Image 1: The VILTROX C-AF 2X II Teleplus 2.0X Teleconverter, showing its compact design and red alignment dots.
Image 2: The teleconverter attached between a Canon DSLR camera and a telephoto lens, illustrating its function and key features like autofocus, 2x magnification, and USB firmware upgrade capability.
3. Compatibility
This teleconverter is designed for use with Canon EF mount lenses and Canon EOS SLR cameras. Please observe the following compatibility guidelines:
- EF Lenses Only: This teleconverter does not support Canon EF-S lenses.
- Recommended Focal Length: Best performance is achieved with lenses of 100mm or more fixed focal length. It is not recommended for short-focus lenses such as 60mm.
- Camera Compatibility: Compatible with Canon EOS SLR cameras.
If you are uncertain about compatibility with your specific camera and lens models, consult the VILTROX customer service before use.
4. Package Contents
Verify that all items are present in the package:
- VILTROX C-AF 2X II Lens Adapter (1 unit)
- Lens Dust Cap (2 units)
- User Manual (1 unit)
5. Installation and Removal
Follow these steps to properly install and remove the teleconverter:
5.1. Attaching the Teleconverter to a Lens
- Align the red circle mark on the VILTROX C-AF 2X II Teleplus with the corresponding red circle mark on your Canon EF lens.
- Rotate the teleconverter clockwise until you hear a distinct "CLICK" sound, indicating it is securely locked onto the lens.
5.2. Attaching the Lens and Teleconverter Assembly to a Camera
- Align the red circle mark on the teleconverter (now attached to the lens) with the red circle mark on your Canon EOS SLR camera's lens mount.
- Rotate the entire assembly (lens + teleconverter) counter-clockwise until you hear a "CLICK" sound, confirming it is securely attached to the camera.
5.3. Removal
To remove the teleconverter, reverse the installation steps. First, detach the lens and teleconverter assembly from the camera, then detach the teleconverter from the lens.
6. Operating Instructions
Once installed, the VILTROX C-AF 2X II Teleplus operates seamlessly with your camera and lens. The primary function is to extend the focal length, effectively doubling it. For example, a 70-200mm lens will become a 140-400mm lens when the teleconverter is attached.
- Autofocus: The teleconverter supports the autofocus function of your lens. However, autofocus speed may be affected, especially in low light or with certain lens combinations.
- Exposure: The teleconverter will reduce the effective aperture by approximately 2 stops (e.g., an f/2.8 lens becomes an f/5.6 lens). The camera's exposure system will automatically compensate for this change.
- Depth of Field: The depth of field will be approximately half of the original lens at the same effective aperture.
Image 3: A visual comparison demonstrating the magnification effect of the teleconverter on a subject.
Image 4: Detailed views of the teleconverter's components, including the USB port for firmware upgrades, the 11-pin copper gold-plated electronic contacts for reliable communication, and the multi-layer coated optical glass lens elements.
7. Specifications
| Specification | Detail |
|---|---|
| Magnification | 2 times (2X) |
| Depth of Field | Half of the original lens |
| Minimum Stacking Focal Length | Equal to the original lens |
| Optical Construction | 7 elements in 4 groups |
| Focus Mode | Full auto focus |
| Lens Coating | Multi-coated |
| Exposure Factor | Approx. 4 times (equivalent to 2 aperture stops) |
| Dimensions (Diameter x Length) | Approx. 68mm x 51mm (2.7 x 2.1 inches) |
| Weight | Approx. 154g (7 ounces) |
| Firmware Upgrade | USB upgrade interface |
Image 5: A graphical representation of the product's key specifications and dimensions.
8. Maintenance
To ensure the longevity and optimal performance of your teleconverter, follow these maintenance guidelines:
- Cleaning: Use a soft, lint-free cloth to clean the exterior. For optical surfaces, use a lens cleaning solution and a microfiber lens cloth. Avoid touching the glass elements directly with your fingers.
- Storage: When not in use, attach the front and rear dust caps to protect the optical elements and contacts. Store the teleconverter in a dry, cool place, away from direct sunlight and extreme temperatures.
- Handling: Handle the teleconverter with care to avoid dropping or impacting it, which could damage the internal optics or electronic contacts.
- Moisture: The teleconverter has a weather-resistant design, but it is not waterproof. Avoid exposing it to heavy rain or submerging it in water. If it gets wet, dry it immediately with a soft cloth.
9. Troubleshooting
If you encounter issues while using your VILTROX C-AF 2X II Teleplus, refer to the following common problems and solutions:
| Problem | Possible Cause / Solution |
|---|---|
| Slow Autofocus | Teleconverters can inherently slow down autofocus speed, especially in low light or with lenses that have smaller maximum apertures. Ensure sufficient light and contrast in your subject. Some lenses may perform better than others. |
| Autofocus Issues at High Zoom | Some lens and teleconverter combinations may struggle with autofocus accuracy or speed when the lens is zoomed to its maximum focal length. Try focusing at a slightly wider focal length or using manual focus if necessary. |
| Diminished Image Quality | Teleconverters can sometimes introduce a slight reduction in image sharpness or contrast, particularly at the edges of the frame or when shooting wide open. This is a common characteristic of optical extenders. Ensure the lens and teleconverter are clean and properly mounted. Using a slightly smaller aperture (e.g., f/8) can sometimes improve sharpness. |
| Teleconverter Not Recognized by Camera | Ensure the teleconverter is securely mounted to both the lens and the camera, with a distinct "CLICK" sound at each connection. Check that the electronic contacts on both the teleconverter and the lens/camera are clean and free of debris. Try cleaning the contacts with a clean, dry cloth. |
| Incompatible Lens/Camera | Verify that your lens is a Canon EF mount lens (not EF-S) and that your camera is a compatible Canon EOS SLR model. Refer to the compatibility section of this manual. |
10. Warranty and Support
VILTROX products are manufactured to high-quality standards. For information regarding warranty coverage, technical support, or service, please refer to the warranty card included with your product or visit the official VILTROX website. Keep your purchase receipt as proof of purchase for warranty claims.
