Take a step up the unique ladder from your A7-series kit zoom lens with the Tamron 28-75mm f/2.8 Di III RXD
ByMatthew Richards03 November 2019
There’s an f/2.8 sized hole in the ‘affordable’ range of Sony own-brand lenses for its full-frame E-mount cameras. That’s neatly filled by the Tamron 28-75mm f/2.8 Di III RXD lens, which delivers fabulous image quality, has great handling characteristics, và is comfortably compact và lightweight. It’s tailor-made for Sony’s mirrorless full-frame bodies and is hard to lớn beat, at any price.
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For• Faster aperture than the Sony 28-70mm• Constant aperture through the zoom range• Great image unique and all-round performance
Taken at 28mm, this shot exhibits some màu sắc fringing in the top left corner, when the in-camera correction is switched off (Image credit: Matthew Richards)
Tamron 28-75mm f/2.8 Di III RXD: Build và handling
The Tamron 28-75mm standard zoom takes over neatly from its 17-28mm stablemate. Not only vị the focal lengths follow on without any gap or overlap, but both lenses have the same high-quality handling characteristics, & both have a fast f/2.8 aperture rating which remains available throughout the whole zoom range.
At the long end, the Tamron is two complete f/stops faster than the Sony 28-75mm competitor. Advantages include the availability of a much tighter depth of field, particularly useful for portraiture and still life photography, along with faster shutter speeds under dull lighting without needing khổng lồ bump up the camera’s sensitivity setting. One downside is that the Tamron lacks stabilization, which is featured in the Sony OSS (Optical SteadyShot) lens, but that’s only really an issue if you have one of the first generation of A7-series cameras, which lacks sensor-shift SteadyShot.
Distortions are well controlled, from 28mm all the way to the longest zoom setting used for this shot (Image credit: Matthew Richards)
Up-market glass includes one LD (Low Dispersion and one XLD (eXtra Low Dispersion) element, for improved sharpness & contrast và to minimize chromatic aberrations, along with three aspherical elements. Tamron’s nano-structure BBAR (Broad-Band Anti-Reflection) coating is also applied, to improve light transmission & reduce ghosting and flare. Like the companion 17-28mm lens, the 28-75mm is unusually compact & lightweight for an f/2.8 standard zoom, without sacrificing anything in performance or weather-sealed build quality.
Tamron 28-75mm f/2.8 Di III RXD: Performance
Excellent image unique is another similarity between this lens and the Tamron 17-28mm. Sharpness và contrast are excellent throughout the entire zoom range, & corner-sharpness is highly impressive even at f/2.8. Distortions are well-controlled, although colour fringing can be noticeable towards the corners, as can vignetting when shooting wide-open. In-camera corrections for these facets of image quality are available in current Sony bodies.
Autofocus is courtesy of Tamron’s RXD (Rapid eXtra-silent stepping Drive) system, which is both very fast & very quiet in operation. Accuracy proved very consistent in our tests, right down to the impressively short minimum focus distance, which ranges from 19cm to 39cm as you extend through the zoom range. Naturally, the Tamron can’t compete with 85mm f/1.4 or f/1.8 prime lenses for giving a really tight depth of field but, especially at the long end, you can throw the background out of focus and the chất lượng of bokeh is very pleasant
(Image credit: Future)
Centre-sharpness is outstanding even at f/2.8, while mid-to-edge sharpness proved much better in real-world shooting than close-range lab tests would suggest.
Fringing
(Image credit: Future)
Color fringing is extremely minimal in the short half of the zoom range và remains very minor in the longer half.
Distortion
(Image credit: Future)
There’s a typical swing from barrel lớn pincushion as you extend through the zoom range but it’s pretty minor throughout.
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Tamron 28-75mm f/2.8 Di III RXD: Verdict
Sharpness is very impressive, even in the extreme corners of the frame, this shot being taken at 28mm (Image credit: Matthew Richards)
Tamron has come up with the perfect lens for everyday shooting on a Sony A7-series body. It gives you a generous zoom range that stretches from wide-angle to lớn short telephoto focal lengths, along with a fast & constant f/2.8 aperture. And, unlike the Sony 24-70mm G Master lens, the Tamron does this while keeping the size and weight to lớn easily manageable proportions. Image chất lượng and all-round performance are exceptional, making the lens unbeatable value at the price.
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Matthew Richards is a photographer & journalist, that has spent years using and reviewing all manner of photo gear. He is Digital Camera World"s principal lens reviewer – and has tested more primes và zooms than most people have had hot dinners!
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