Sony A7R IV + TAMRON 17-28mm

Highlights of the lens TAMRON 17-28mm f2.8

With a flexible wide-angle range, TAMRON 's 17-28mm f/2.8 Di III RXD model 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 landscapes, astrophotography and architectural photography. Its bright constant maximum aperture of f/2.8 complements this range and allows for greater control over depth of field along with improved low-light performance. The optical design incorporates both XLD and LD elements, which produce a highly corrected image with reduced chromatic aberrations and color stripes to improve color clarity and accuracy. The individual elements also feature TAMRON's BBAR coating, which suppresses flare and ghosting for greater contrast when working in backlight conditions and in severe lighting conditions. In addition, added to the versatility, the RXD stepper motor allows for fast and almost silent autofocus to fit still images and video, along with a full-time manual focus override and a minimum focusing distance of 7.5". It also features a moisture-resistant construction along with a fluorine-coated front element to protect against fingerprints and stains.

The versatile wide-angle zoom is designed for SONY full-frame E-mount mirrorless cameras, however, it can also be used with APS-C models, where it will provide an equivalent focal length range of 25.5-42mm.
The f/2.8 constant brightness maximum aperture allows for constant brightness throughout the zoom range and offers better control over depth of field.
XLD (eXtra Low Dispersion) and LD (Low Dispersion) elements greatly reduce color stripes and chromatic aberrations throughout the zoom range for greater clarity and color accuracy.
BBAR (Broadband Anti-Reflective) coating has been applied to individual elements to suppress internal reflections, flares and ghosting to achieve greater contrast and colour fidelity when working in bright lighting conditions.
The RXD (Rapid eXtra-silent stepping Drive) autofocus motor delivers impressively quiet, fast and smooth focusing performance to suit still images and video applications. This focusing system also offers a minimum focusing distance of just 7.5" and a maximum magnification of 1:5.2 for working with foreground subjects. It is also possible to override full-time manual focus and supports SONY 's direct manual focus or Tuned Manual Control function.
A moisture-resistant construction benefits the use of this lens in inclement conditions, and a fluorine coating has also been applied to the front lens element to protect against dust, dirt and stains.
The rounded nine-leaf diaphragm contributes to a pleasant quality of bokeh.