The Tamron 17-28mm f/2.8 Di III RXD lens is a versatile zoom lens designed for full-frame Sony E-mount mirrorless cameras. It offers a flexible wide-angle range, making it suitable for various photography genres such as landscape, astrophotography, and architectural shooting. With its bright f/2.8 constant maximum aperture, the lens provides increased control over depth of field and performs well in low-light conditions. The optical design incorporates XLD (eXtra Low Dispersion) and LD (Low Dispersion) elements, resulting in a highly corrected image with minimal chromatic aberrations and color fringing. Tamron’s BBAR (Broad-Band Anti-Reflection) coating is applied to individual elements, effectively suppressing flare and ghosting for improved contrast, especially when working in challenging lighting conditions.
The lens features an RXD (Rapid eXtra-silent stepping Drive) autofocus motor, enabling quick and near-silent autofocus performance suitable for both stills and video. It also offers full-time manual focus override, allowing for precise manual adjustments. The lens has a minimum focusing distance of 7.5″, making it capable of capturing close-up subjects. It is compatible with Sony’s Direct Manual Focus function for fine-tuned manual control.
Designed to withstand inclement weather conditions, the lens has a moisture-resistant construction. Additionally, a fluorine coating is applied to the front lens element, protecting against fingerprints and smudging. The rounded nine-blade diaphragm contributes to a pleasing bokeh quality, enhancing the aesthetic appeal of your images.
The lens is designed for full-frame Sony E-mount mirrorless cameras but can also be used with APS-C models, providing a 25.5-42mm equivalent focal length range. Its constant f/2.8 maximum aperture ensures consistent brightness throughout the zoom range, allowing for creative control over depth of field. The XLD and LD elements effectively reduce color fringing and chromatic aberrations, resulting in improved clarity and color accuracy. The BBAR coating suppresses internal reflections, flare, and ghosting, enhancing contrast and color fidelity in strong lighting conditions. With its impressive autofocus performance, weather-resistant construction, and high-quality optics, this lens is a versatile tool for capturing stunning wide-angle shots.