Sigma 70-200mm f/2.8 APO DG HSM

The Sigma 70-200mm f/2.8 APO DG HSM lens is a versatile telephoto zoom lens designed for various photography applications, including sports, wildlife, portrait, and event photography. Below are the key features and specifications of this lens:

Key Features:

1. Focal Length: 70-200mm

2. Maximum Aperture: f/2.8

3. Lens Construction:

- Elements: 18

- Groups: 15

- SLD (Special Low Dispersion) glass elements to reduce chromatic aberration

4. Angle of View:

- 34.3° - 12.3°

5. Minimum Focusing Distance:

- 1.8 meters (5.9 feet)

6. Maximum Magnification Ratio: 1:7.8

7. Filter Size:77mm

8. Dimensions:

- Diameter: 86.4mm

- Length: 184.4mm

9. Weight: Approximately 1,370 grams (48.3 ounces)

10. Mount Compatibility: Canon EF mount, among others

11. Diaphragm Blades: 9, rounded for smooth bokeh

### Advanced Features:

- **APO (Apochromatic) Design:** Uses SLD (Special Low Dispersion) glass elements to correct chromatic aberrations and provide high-quality images.

- **DG (Digital Grade):** Optimized for digital cameras with coatings that reduce flare and ghosting.

- **HSM (Hyper Sonic Motor):** Ensures fast, quiet, and accurate autofocusing. It also allows for full-time manual focus override.

- **EX Finish:** Part of Sigma's EX series, which denotes a professional-level lens with high build quality and performance.

### Image Quality:

- The lens delivers sharp and high-contrast images throughout the zoom range.

- The large f/2.8 aperture allows for excellent low-light performance and the ability to achieve a shallow depth of field.

### Build and Handling:

- The lens is robustly built with a high-quality finish, making it suitable for professional use.

- It includes a tripod collar for better balance and stability when using a tripod.

- Comes with a petal-type lens hood to reduce lens flare and protect the front element.

### Use Cases:

- **Sports Photography:** The 70-200mm focal range combined with a fast f/2.8 aperture makes it ideal for capturing fast-moving subjects.

- **Portrait Photography:** The ability to zoom in and out and achieve a creamy bokeh makes it a popular choice for portrait photographers.

- **Event Photography:** Its versatility allows for capturing a range of shots, from candid moments to close-up details.

### Compatibility:

- Designed for use with Canon EF mount cameras, both full-frame and APS-C sensor formats.

- Can be used with Sigma teleconverters to extend the focal length further, although this may affect the maximum aperture.

### Additional Accessories:

- **Lens Hood:** Petal-shaped hood included

- **Tripod Collar:** For better support and stability

- **Case:** A soft case for protection during transport

### Comparisons:

- Compared to Canon's own 70-200mm f/2.8L IS II or III, the Sigma offers a more affordable alternative with competitive image quality.

- It lacks image stabilization (IS), which is present in some Canon models, so users need to be mindful of the potential for camera shake at slower shutter speeds.

This lens is a popular choice for photographers looking for a high-performance telephoto zoom lens at a more affordable price point than brand-name alternatives, while still delivering excellent image quality and build.