While mirrorless systems have now been around for nearly a decade, third-party lens makers have been strangely cautious about supporting them. The big two – Sigma and Tamron – have been especially reluctant to commit, which has left an opening for the smaller players. This has turned out to be particularly attractive with Sony’s full-frame FE-mount system, whose owners are more likely to buy additional lenses than APS-C or Micro Four Thirds users.
So far, only two third-party manufacturers offer autofocus lenses for full-frame Sony mirrorless, with Samyang targeting the budget-conscious end of the market while Zeiss goes after the premium sector. But manual focus is also a perfectly viable option, particularly for wideangle lenses, and at Photokina 2016 we saw an explosion of choice in this area.
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https://www.amateurphotographer.co.uk/reviews/lenses/tokina-firin-20mm-f2-mf-fe
