Every time the biennial Photokina tradeshow in Germany rolls around, alongside the selection of brand-new products, there are invariably some prototypes and development concepts on display, giving us an idea of where manufacturers will be taking us in the not-too-distant future. This year, lens maker Tamron has an example which it says is the first of its kind.
Describing the achievement its new lens will set requires quite a bit of description, but it's nonetheless a very interesting optic. The Tamron SP 15-30mm F/2.8 Di…
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