Comprising a flexible wide-angle range, the 17-28mm f/2.8 Di III RXD from Tamron
is a versatile zoom for full-frame Sony E-mount mirrorless cameras.
Covering ultra-wide to wide focal lengths, this lens is particularly
suitable for landscape, astrophotography, and architectural shooting.
Its bright f/2.8 constant maximum aperture complements this range and
affords increased control over depth of field along with enhanced
low-light performance. The optical design incorporates a both XLD and LD
elements, which produce a highly corrected image with reduced chromatic
aberrations and color fringing for improved clarity and color accuracy.
Individual elements also feature Tamron's BBAR coating, which
suppresses flare and ghosting for greater contrast when working in
backlit and harsh lighting conditions. Additionally, adding to the
versatility, an RXD stepping motor enables quick, near-silent autofocus
performance to suit stills and video, along with full-time manual focus
override and a minimum focusing distance of 7.5". Suiting this lens's
use in inclement weather conditions, it also features a
moisture-resistant construction along with a fluorine-coated front
element to protect against fingerprints and smudging.