1. Product Overview
The Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens is designed to capture a unique, distorted perspective, presenting a full-frame image within the camera's field of view. This lens is suitable for photographers seeking creative and artistic shots, including wedding, underwater, and scenic photography, by utilizing acute perspectives not visible to the human eye.
Key features include:
- Digitally optimized diagonal fisheye auto-focus lens.
- Minimum shooting distance of 5.9 inches (15 cm).
- Offers a 180-degree diagonal field of view.
- Supplied with a gelatin filter holder at the rear.
- Multi-layer lens coating to reduce flare and ghosting.
Figure 1: Front view of the Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens.
2. Setup
2.1 Attaching the Lens to Your Camera
- Ensure your camera is powered off.
- Remove the rear lens cap and the camera body cap.
- Align the mounting index (red dot) on the lens with the corresponding index on your Nikon SLR camera body.
- Insert the lens into the camera mount and rotate it clockwise until it clicks into place.
- If using with a Canon mirrorless camera, an EF to RF adapter is required. Attach the lens to the adapter first, then attach the adapter to the camera body.
Figure 2: Rear view of the lens, showing the camera mount.
2.2 Lens Hood and Front Element Protection
The lens features a built-in, non-removable lens hood. This hood provides protection for the bulbous front element of the fisheye lens. Always use the supplied lens cap when the lens is not in use to prevent damage to the front element.
Figure 3: The curved front element and integrated lens hood.
3. Operating the Lens
3.1 Focus Modes
The lens supports both autofocus (AF) and manual focus (MF). A switch on the lens barrel allows you to toggle between these modes. For precise control, especially in challenging lighting conditions or for specific creative effects, manual focus can be utilized. The autofocus system is designed for reliable performance.
3.2 Aperture and Depth of Field
With a maximum aperture of f/2.8, this lens performs well in low-light conditions. The wide aperture also allows for creative control over depth of field, though fisheye lenses inherently have a large depth of field due to their wide angle.
3.3 Fisheye Effect and Field of View
The 15mm focal length provides a 180-degree diagonal field of view, creating the characteristic barrel distortion of a fisheye lens. This effect can be used to capture expansive scenes, emphasize perspective, or create unique artistic compositions. Experiment with different angles and distances to achieve desired results.
3.4 Minimum Focusing Distance
The lens has a minimum focusing distance of 5.9 inches (15 cm) and a magnification ratio of 1:3.8. This allows for close-up photography with a wide, distorted background, offering unique creative possibilities.
3.5 Gelatin Filter Usage
A gelatin filter holder is located at the rear of the lens. This allows for the insertion of gelatin filters for color correction or other creative effects, expanding the lens's versatility.
Video 1: Official product overview of the Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens, demonstrating its features and capabilities.
4. Maintenance
4.1 Cleaning the Lens
- Use a lens blower brush to remove dust and loose particles from the lens surfaces.
- For smudges or fingerprints, use a clean microfiber lens cloth and a small amount of lens cleaning solution. Apply the solution to the cloth, not directly to the lens.
- Clean the front and rear elements gently, working from the center outwards in a circular motion.
4.2 Storage
- Always attach the front lens cap and rear lens cap when the lens is not in use.
- Store the lens in a dry, cool place, away from direct sunlight and extreme temperatures.
- If storing for extended periods, consider using a dehumidifying agent to prevent mold growth.
5. Troubleshooting
5.1 Image Distortion
The characteristic barrel distortion is an inherent feature of a fisheye lens, designed to capture a 180-degree diagonal field of view. This is not a defect but a creative effect. To minimize the appearance of distortion, try to keep the horizon line centered in your frame. Post-processing software can also be used to correct or enhance the fisheye effect as desired.
5.2 Flare and Ghosting
While the multi-layer lens coating is designed to reduce flare and ghosting, these can still occur, especially when shooting directly into strong light sources. The built-in lens hood helps, but repositioning your camera or using your hand to shade the lens can further mitigate these effects.
5.3 Autofocus Issues
If autofocus is not functioning correctly, ensure the AF/MF switch on the lens is set to AF. Check your camera's focus settings and ensure there is sufficient contrast in your subject for the autofocus system to lock on. In very low light or with low-contrast subjects, switching to manual focus may be necessary.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Sigma |
| Model Number | 476306 |
| Focal Length | 15mm |
| Maximum Aperture | f/2.8 |
| Lens Type | Diagonal Fisheye |
| Compatible Mountings | Nikon F (FX) |
| Minimum Focusing Distance | 5.9 inches (15 cm) |
| Magnification Ratio | 1:3.8 |
| Field of View | 180 degrees (diagonal) |
| Product Dimensions | 2.56 x 2.91 x 2.91 inches |
| Item Weight | 13.1 ounces |
| Manufacturer | Sigma Corporation of America |
| Included Accessories | Gelatin filter holder at the rear, Fitted Padded Lens Cover |
7. Warranty and Support
7.1 Warranty Information
This Sigma lens comes with a 4-year US warranty. Please retain your proof of purchase for warranty claims. For detailed terms and conditions, refer to the warranty card included with your product or visit the official Sigma website.
7.2 Customer Support
For technical assistance, service, or any inquiries regarding your Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens, please contact Sigma Customer Support. Contact information can typically be found on the official Sigma website or in the product packaging.
