Sigma 28-70mm F2.8 DG DN Contemporary Lens Instruction Manual

1. Overview

The SIGMA 28-70mm F2.8 DG DN | Contemporary lens is designed for full-frame mirrorless cameras, offering outstanding optical performance in a lightweight and compact body. This lens is based on the optical design of the 24-70mm F2.8 DG DN | Art, ensuring high image quality across its zoom range. It provides a versatile focal length for various photographic applications, from wide-angle landscapes to portraits.

2. Key Features

• Internal Focusing: Ensures consistent lens length and stable handling.
• Superb Build Quality: Constructed with high-quality materials for durability.
• Focus Mode Switch: Easily switch between autofocus (AF) and manual focus (MF).
• Nano Porous Coating: Reduces flare and ghosting for clear, high-contrast images.
• Lightweight and Compact Body: Designed for portability and comfortable day-to-day use.

3. Package Contents

Upon opening the product box, please ensure all the following items are present:

• Sigma 28-70mm F2.8 DG DN Lens
• Lens Hood
• Front Lens Cap
• Rear Lens Cap
• Lens Case

4. Setup

Attaching the Lens to Your Camera

1. Ensure both the camera and lens are powered off.
2. Remove the rear lens cap from the lens and the body cap from the camera.
3. Align the mounting index (white dot) on the lens barrel with the mounting index on the camera body.
4. Insert the lens into the camera's mount and rotate it clockwise until it clicks into place. Do not force the lens.

Attaching the Lens Hood

1. Align the red dot on the lens hood with the red dot on the front of the lens.
2. Push the hood onto the lens and rotate it clockwise until it locks securely.

Image: Sigma 28-70mm F2.8 DG DN lens mounted on a Sony E-mount camera, top view. This image illustrates the lens properly attached to a camera body.

Image: A hand holding a Sony E-mount camera with the Sigma 28-70mm F2.8 DG DN lens attached, demonstrating its compact size when handheld.

5. Operating Instructions

Focus Mode Selection

The lens features a focus mode switch on its barrel. Slide the switch to select between:

• AF (Autofocus): For automatic focusing.
• MF (Manual Focus): For manual focusing by rotating the focus ring.

Zoom Operation

Rotate the zoom ring on the lens barrel to adjust the focal length between 28mm and 70mm. The lens features an internal zoom mechanism, meaning its physical length does not change when zooming.

AFL Button

The AFL (Autofocus Lock) button can be customized via your camera's menu to perform various functions, such as locking autofocus, activating eye AF, or other programmable actions.

6. Maintenance

• Cleaning the Lens: Use a soft, lint-free cloth and a lens cleaning solution specifically designed for optical surfaces. Avoid touching the glass elements directly with your fingers.
• Storage: When not in use, store the lens with both front and rear caps attached in a dry, cool place away from direct sunlight and extreme temperatures.
• Protection: Always use the provided lens hood to protect the front element from accidental bumps and stray light.

7. Troubleshooting

• Lens not attaching securely: Ensure the mounting indexes are correctly aligned and rotate until a click is heard. Do not force.
• Autofocus not working: Check the focus mode switch on the lens and camera body to ensure it is set to AF. Verify that the camera's autofocus settings are appropriate for your shooting conditions.
• Dust or smudges on images: Clean the front and rear lens elements carefully. If the issue persists, check your camera's sensor for dust.

8. Specifications

Image: Diagram illustrating the physical dimensions, focal length (28-70mm), aperture (F2.8), weight (470g), minimum focusing distance (19-38cm), maximum magnification (1:3.3), and filter size (67mm) of the Sigma 28-70mm F2.8 DG DN lens.

9. Warranty and Support

For warranty information and customer support, please refer to the official Sigma website or contact your local authorized Sigma dealer. Keep your proof of purchase for any warranty claims.