Description

Key Features

• Format: APS-C | f/2.8 to f/16

• 35mm Equivalent Focal Length: 16.5-30mm

• Fast ultra-wide-angle zoom lens

• Rapid eXtra Silent Stepping Drive (RXD) autofocus motor

• 1 XLD element, 2 GM aspherical elements, and 2 LD elements

• BBAR-G2 lens coating

• Weather-sealed construction

• Rounded 7-blade diaphragm

Tamron 11-20mm f/2.8 Di III-A Overview

The dynamic Tamron 11-20mm F/2.8 Di III-A2 RXD is a fast-aperture, ultra-wide-angle zoom lens for Sony E-mount APS-C mirrorless cameras. It features a bright, constant maximum aperture of f/2.8 alongside a compact and lightweight design. This ultra-wide lens is ideal for landscape, astrophotography, and architectural photography. Its bright f/2.8 aperture complements this focal range, offering greater control over depth of field along with enhanced performance in low-light conditions.

The optical design incorporates one XLD (eXtra Low Dispersion) element, two LD (Low Dispersion) elements, and two GM (Glass-Molded Aspherical) elements to produce a highly corrected image. This configuration reduces chromatic aberrations and color fringing to achieve superior clarity and color fidelity. Individual elements also feature Tamron’s BBAR coating, which suppresses flare and ghosting for excellent contrast when working in backlit or challenging lighting conditions.

A responsive RXD stepping motor enables fast and virtually silent autofocus performance, making it ideal for both photography and video. The minimum focusing distance is just 15 cm (5.9 in) at the widest end of the zoom range. This opens up the possibility of capturing stunning wide-angle macro shots with a unique perspective—making close objects appear larger and distant objects smaller. Additionally, the maximum f/2.8 aperture creates a shallower depth of field, producing a smooth background bokeh effect. The moisture-resistant construction protects the lens in adverse weather conditions, and a fluorine coating on the front element shields it against dust, dirt, and smudges.

Technical Details

• Versatile Ultra-Wide Zoom: Designed for APS-C format Sony E-mount mirrorless cameras, providing a 35mm equivalent focal length range of 16.5-30mm.

• Constant f/2.8 Aperture: The bright, constant maximum aperture of f/2.8 ensures consistent brightness throughout the zoom range and offers improved control over depth of field.

• Advanced Optics: XLD (eXtra Low Dispersion), LD (Low Dispersion), and GM (Glass-Molded Aspherical) elements drastically reduce color fringing, chromatic aberrations, and image distortion across the entire zoom range for enhanced sharpness and color accuracy.

• BBAR-G2 Coating: The Broad-Band Anti-Reflection G2 coating has been applied to internal elements to suppress reflections, flare, and ghosting, achieving higher contrast and color fidelity.

• RXD Autofocus Motor: The Rapid eXtra-silent stepping Drive (RXD) motor delivers impressively quiet, fast, and smooth focusing performance, ideal for both still photography and video applications.

• Dynamic Close-Up Capabilities: A minimum focusing distance of 15 cm at 11mm allows you to explore dynamic wide-angle macro photography, exaggerating perspective by making close objects look larger and distant ones look smaller. Utilizing the f/2.8 maximum aperture yields a shallow depth of field with smooth background bokeh details.

• Weather-Resistant Design: Engineered with a moisture-resistant structure for reliable use in harsh weather conditions, complemented by a fluorine coating on the front element to protect against dust, dirt, and fingerprints.

• 7-Blade Diaphragm: The rounded seven-blade diaphragm contributes to a pleasing, smooth bokeh quality.