1. Introduction
The EBYPHAN C-AF 2XII Teleplus Teleconverter is an optical accessory designed to extend the focal length of compatible Canon EF mount lenses by a factor of 2x. This teleconverter maintains autofocus (AF) functionality and transmits Exif information to the camera body. It is particularly useful for long-distance photography, such as wildlife, sports, or landscape photography, allowing you to capture subjects with greater magnification.
The teleconverter features 7 optical glasses arranged in 4 groups, ensuring image quality. It includes a micro USB port for firmware upgrades, enhancing compatibility with future camera and lens models.
2. Product Overview
Figure 1: Detailed view of the EBYPHAN C-AF 2XII Teleplus Teleconverter, highlighting its key components including the camera mount index, optical glass, camera-end contactor, lens mount index, USB upgrade port, lens release button, and lens-end contactor.
Key Features:
- 2x Magnification: Doubles the focal length of the attached lens.
- Auto-Focus (AF) Support: Maintains AF functionality with compatible lenses.
- Exif Information Transmission: Camera receives correct lens data.
- Optical Design: 7 elements in 4 groups for image quality.
- Firmware Upgrade: Micro USB port for future compatibility.
- Durable Construction: Metal contacts for reliable communication.
3. Setup and Installation
3.1 Compatibility
This teleconverter is designed exclusively for Canon EF mount lenses and DSLR cameras. It is not compatible with EF-S mount lenses. For optimal performance, it is recommended for fixed focal length L-series lenses 100mm and above, as well as specific zoom lenses:
- EF 70-200mm f/2.8L
- EF 70-200mm f/2.8L IS
- EF 70-200mm f/4L
- EF 100-400mm f/4.5-5.6L
Using this teleconverter with lenses having a focal length less than 60mm is not recommended.
Figure 2: The teleconverter is compatible with Canon EF lenses, but not EF-S lenses.
3.2 Attaching the Teleconverter to the Camera Body
- Align the red dot on the teleconverter with the red dot on your Canon EF mount camera body.
- Insert the teleconverter into the camera mount.
- Rotate the teleconverter clockwise until it clicks into place, indicating it is securely locked.
3.3 Attaching the Lens to the Teleconverter
- Align the red dot on your compatible Canon EF lens with the red dot on the teleconverter.
- Insert the lens into the teleconverter mount.
- Rotate the lens clockwise until it clicks into place, ensuring a secure connection.
Figure 3: The teleconverter securely mounted between a Canon DSLR camera body and a compatible EF lens.
3.4 Using with Canon RF Mount Cameras
If you are using a Canon RF mount camera (e.g., EOS R, R10), you will need an additional EF-to-RF mount adapter to use this EF teleconverter. The teleconverter first attaches to the EF-to-RF adapter, and then the adapter (with teleconverter) attaches to the RF camera body.
4. Operating the Teleconverter
4.1 Autofocus Functionality
The C-AF 2XII Teleplus supports the autofocus (AF) function of your original lens. However, the effectiveness of autofocus can be influenced by several factors:
- Light Conditions: Autofocus may perform optimally in bright light. In subdued or low-light conditions, the camera's AF system might struggle, leading to slower focusing or 'hunting' for focus.
- Lens Aperture: The teleconverter effectively reduces the maximum aperture of the lens by two stops (e.g., an f/2.8 lens becomes f/5.6). This can impact AF performance, especially with cameras that require a brighter aperture for certain AF points.
- Camera Model: Some camera bodies have more advanced AF systems that can handle lower light and smaller apertures better than others.
If autofocus is inconsistent, consider switching to manual focus (MF) or using a tripod for stability.
Figure 4: The teleconverter supports autofocus, increasing focal length by 2 times.
4.2 Exposure and Depth of Field
When using the 2x teleconverter, the effective aperture of your lens will be reduced by two stops. For example, a lens with a maximum aperture of f/2.8 will operate at an effective maximum aperture of f/5.6. This means the camera will require approximately four times more light (equal to 2 aperture stops) for the same exposure.
The depth of field will be approximately half of that of the original lens at the same effective aperture. This can be advantageous for isolating subjects with a shallower depth of field.
4.3 Photography Tips with Teleconverter
- Stability: Due to the increased focal length, camera shake becomes more pronounced. Using a sturdy tripod or monopod is highly recommended, especially in lower light conditions or when shooting at the maximum focal length.
- ISO Settings: You may need to increase your camera's ISO setting to compensate for the reduced effective aperture, particularly when shooting handheld or in dim environments.
- Shutter Speed: To minimize blur from camera shake, use a faster shutter speed. A general rule of thumb is to use a shutter speed equal to or faster than 1 divided by the effective focal length (e.g., for an 800mm effective focal length, use 1/800s or faster).
- Focusing: For critical focus, especially with static subjects, consider using Live View with magnification to fine-tune manual focus.
5. Maintenance
5.1 Cleaning
- Use a soft, lint-free cloth to clean the exterior of the teleconverter.
- For optical surfaces, use a lens blower to remove dust, followed by a lens brush. If smudges remain, use a specialized lens cleaning solution and a microfiber lens cloth.
- Avoid touching the optical elements directly with your fingers.
- Keep the electronic contacts clean and free of debris to ensure proper communication between the lens and camera.
5.2 Storage
When not in use, store the teleconverter with both front and rear caps attached in a dry, cool place away from direct sunlight and extreme temperatures. Avoid environments with high humidity to prevent mold growth on the optical elements.
5.3 Firmware Upgrade
The teleconverter is equipped with a micro USB port for firmware upgrades. This allows for improved compatibility with new camera models and lenses, as well as potential performance enhancements. To upgrade the firmware:
- Visit the EBYPHAN official website or contact customer support to download the latest firmware file and upgrade instructions.
- Connect the teleconverter to your computer using a micro USB cable.
- Follow the specific instructions provided with the firmware download to complete the upgrade process.
6. Troubleshooting
If you encounter issues with your EBYPHAN C-AF 2XII Teleplus Teleconverter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Autofocus is slow or 'hunts' | Low light conditions, small effective aperture, incompatible lens, dirty contacts. | Shoot in brighter conditions, increase ISO, ensure lens compatibility, clean electronic contacts, switch to manual focus. |
| Camera does not recognize lens or teleconverter | Improper mounting, dirty electronic contacts, incompatible lens/camera. | Ensure teleconverter and lens are securely mounted and clicked into place. Clean all electronic contacts on the camera, teleconverter, and lens. Verify lens and camera compatibility. |
| Images are blurry or out of focus | Camera shake, autofocus inaccuracy, lens not fully compatible, dirty optical elements. | Use a tripod/monopod. Increase shutter speed. Check AF performance and consider manual focus. Clean optical elements. Ensure lens is within recommended compatibility. |
| Loose fit or radial play when mounted | Manufacturing tolerance, wear and tear. | While some minor play might exist, significant looseness can affect performance. Ensure secure mounting. If excessive, contact customer support. |
| Firmware upgrade fails | Incorrect firmware file, unstable USB connection, power interruption. | Download the correct firmware from the official source. Use a reliable USB cable and port. Ensure stable power supply during upgrade. Do not disconnect during the process. |
7. Specifications
| Feature | Description |
|---|---|
| Model | C-AF 2XII Teleplus |
| Mount Type | Canon EF-Mount |
| Magnification | 2X |
| Optical Construction | 7 elements in 4 groups |
| Focus Mode | Full Auto Focus (AF) |
| Lens Coating | Multi-coated |
| Exposure Factor | Approx. 4 times (equal to 2 aperture stops) |
| Depth of Field | Half of the original lens |
| Firmware Upgrade Port | Micro USB |
| Dimensions (Diameter x Length) | Approx. 68 x 51mm |
| Weight | Approx. 154g |
| Color | White |
8. Warranty and Support
8.1 Warranty Information
Please refer to the warranty card included with your product or visit the official EBYPHAN website for detailed warranty terms and conditions. Warranty coverage typically includes defects in materials and workmanship for a specified period from the date of purchase.
8.2 Customer Support
For technical assistance, troubleshooting, or inquiries regarding your EBYPHAN C-AF 2XII Teleplus Teleconverter, please contact EBYPHAN customer support through their official website or the contact information provided in your product packaging.