Tamron 17-28mm F/2.8 Di III RXD
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Sony's full-frame mirrorless system has been around for more than five years now, but the big third-party lens makers have only started to pay proper attention to it relatively recently. However while the likes of Zeiss and Samyang have made a decent array of E-mount primes, only Tamron has yet made a native full-frame autofocus zoom. Following on from the highly regarded 28-75mm F/2.8 Di III RXD that it launched in early 2018, the firm has now released a wideangle companion, in the shape of the 17-28mm F/2.8 Di III RXD.
This new optic maintains the same design philosophy, being a large-aperture zoom that achieves a compact size by employing a modest focal-length range. Indeed its 1.6x zoom ratio is surprisingly short, given that such
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