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.