1. Introduction
This manual provides detailed instructions for the proper use, setup, operation, and maintenance of your Sigma 120-300mm F2.8 Sports DG APO OS HSM Lens for Canon. To ensure optimal performance and longevity of your lens, please read this manual thoroughly before use and retain it for future reference.
2. Product Overview
The Sigma 120-300mm F2.8 Sports DG APO OS HSM lens is a high-performance telephoto zoom lens designed for Canon EF mount cameras. It features a constant F2.8 aperture throughout its zoom range, making it suitable for various photographic conditions, especially in low light. Key features include:
- Optical Stabilization (OS): Reduces camera shake for sharper images, particularly at longer focal lengths or slower shutter speeds.
- Two FLD Glass Elements: Fluorite-level performance glass elements minimize chromatic aberration, ensuring high image quality.
- Hyper Sonic Motor (HSM): Provides fast, quiet, and accurate autofocus.
- DG Design: Optimized for digital SLR cameras, ensuring high performance across the entire image frame.
- APO Designation: Apochromatic design further corrects chromatic aberrations.
- Sports Line: Built with robust construction and dust/splash-proof structure for demanding environments.
Figure 2.1: Overall view of the Sigma 120-300mm F2.8 Sports DG APO OS HSM Lens, showcasing its robust build and integrated tripod collar.
3. Setup
3.1 Attaching the Lens to Your Camera
- Ensure both the camera and lens are powered off.
- Remove the rear lens cap and the camera body cap.
- Align the mounting index marks (usually red dots) on the lens and the camera body.
- Insert the lens into the camera's lens mount and turn it clockwise until it clicks into place. Do not force the lens.
- Replace the front lens cap when not in use.
3.2 Initial Checks
After attaching the lens, power on your camera. Test the autofocus and zoom functions to ensure proper communication between the lens and camera body. If any issues arise, power off, re-attach the lens, and re-test.
3.3 Using the USB Dock (Optional)
The Sigma USB Dock (sold separately) allows users to update lens firmware and customize various settings, including autofocus speed, focus limiter range, and Optical Stabilization characteristics. Refer to the USB Dock's instruction manual for detailed usage.
4. Operating the Lens
4.1 Focus Modes
Figure 4.1: Detail of the focus mode, focus limiter, and OS switches on the lens barrel.
The lens features a focus mode switch on its barrel:
- AF (Autofocus): For automatic focusing. The Hyper Sonic Motor (HSM) provides fast and quiet operation.
- MF (Manual Focus): For manual focusing. Rotate the focus ring to adjust focus.
Even in AF mode, full-time manual override is available, allowing you to fine-tune focus manually after autofocus has engaged.
4.2 Focus Limiter Switch
The focus limiter switch helps to speed up autofocus by restricting the focus range. This is particularly useful when photographing subjects at a known distance.
- FULL: Allows the lens to focus across its entire range (from minimum focusing distance to infinity).
- 10m - ∞: Limits the focus range from 10 meters to infinity. Use this setting for distant subjects to prevent the lens from hunting for focus on closer objects.
- ∞ - 10m: Limits the focus range from infinity to 10 meters. This setting is less common but can be customized via the USB Dock.
4.3 Optical Stabilization (OS)
The OS switch activates or deactivates the Optical Stabilization function.
- ON: Activates the OS system to compensate for camera shake.
- OFF: Deactivates the OS system. It is recommended to turn OS off when using a tripod or when shooting at very high shutter speeds where stabilization is not required.
The lens may offer different OS modes (e.g., Mode 1 for general photography, Mode 2 for panning shots), which can often be customized via the USB Dock.
4.4 Zooming
Figure 4.2: The zoom ring with focal length indicators (120mm, 150mm, 180mm, 200mm, 250mm, 300mm).
Rotate the zoom ring to change the focal length between 120mm and 300mm. The lens maintains a constant F2.8 aperture throughout this range.
4.5 Custom Switches (C1, C2)
The lens features custom switches (C1, C2) that allow for personalized settings configured using the Sigma USB Dock. These can be used to store different autofocus speeds, OS modes, or focus limiter ranges, providing quick access to preferred shooting configurations.
5. Maintenance and Care
5.1 Cleaning the Lens
- Use a blower brush to remove dust from the lens surfaces.
- For smudges or fingerprints, use a clean, soft microfiber cloth specifically designed for optics, along with a small amount of lens cleaning solution.
- Never use abrasive materials or harsh chemicals.
- Clean the lens mount contacts with a dry, clean cloth if necessary to ensure proper communication with the camera.
5.2 Storage
- Store the lens in a cool, dry place away from direct sunlight and extreme temperatures.
- Always attach the front and rear lens caps when storing.
- If storing for extended periods, consider using a desiccant to prevent mold and mildew.
5.3 Handling
This is a substantial lens (approximately 6.5 pounds / 2.95 kg). Due to its weight and size, it is highly recommended to use a sturdy monopod or tripod with a robust head for stability and to reduce strain on the camera's lens mount. The integrated tripod collar should be used for mounting to a support system.
Figure 5.1: The Sigma 120-300mm lens attached to a camera body, illustrating its considerable size.
The lens features a dust and splash-proof construction, offering enhanced durability in various shooting conditions. However, it is not fully waterproof and should not be submerged.
6. Troubleshooting
- Autofocus Issues: If the lens struggles to focus, ensure the focus mode switch is set to AF. Check for sufficient light and contrast in your subject. If focusing on subjects surrounded by clutter (e.g., birds in branches), the autofocus system may occasionally struggle. Try switching to manual focus or using a single, precise autofocus point.
- Optical Stabilization Not Working: Ensure the OS switch is set to ON. If using a tripod, it is generally recommended to turn OS OFF.
- Lens Not Communicating with Camera: Power off both camera and lens, detach and re-attach the lens, ensuring it clicks securely into place. Clean the electrical contacts on both the lens and camera body with a dry, clean cloth.
- Unusual Noises: A slight audible click when OS engages is normal. Any other unusual noises should prompt a contact with Sigma customer support.
For persistent issues, consult your camera's manual or contact Sigma customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | 137101 |
| Focal Length | 120-300mm |
| Maximum Aperture | F2.8 (constant) |
| Lens Type | Telephoto Zoom |
| Compatible Mountings | Canon EF |
| Optical Stabilization | Yes |
| Autofocus Motor | Hyper Sonic Motor (HSM) |
| Product Dimensions | 11.46 x 4.88 x 4.88 inches (29.1 x 12.4 x 12.4 cm) |
| Item Weight | 6.5 pounds (2.95 kg) |
| Filter Size | 105mm (∅105) |
8. Warranty and Support
Sigma products are covered by a manufacturer's warranty. The specific terms and duration of the warranty may vary by region and purchase date. Please refer to the warranty card included with your product or visit the official Sigma website for detailed warranty information.
For technical support, service, or warranty claims, please contact Sigma customer service through their official website or the authorized distributor in your region. When contacting support, please have your lens model number (137101) and purchase information readily available.
Legal Disclaimer: This product is sold "as is" as per the manufacturer's legal disclaimer. Users are advised to adhere to all safety guidelines and proper usage instructions provided in this manual.
