On 8 February, Sony announced that the specifications of the company's 'E-mount' would be made available to third party manufacturers. The press release that carried the announcement also carried endorsements from four lens manufacturers: Carl Zeiss, Cosina, Sigma and Tamron.
The most significant endorsement came from Tamron. The company's brief statement confirmed that Tamron 'aim to offer our customers new solutions and unprecedented photo-shooting enjoyment through the manufacture and sale of "E-mount" lenses.'
Today Sigma confirmed that they too will start manufacturing E-Mount lenses and M43 lenses: 'The Sigma Corporation is pleased to announce the development of new lenses for Micro Four Thirds and E-mount camera system.'
In fact Sigma already have a mock up of a future E-Mount lens on display at CP+. It does seem odd that the mock up is of a 30mm f2.8 lens since Sony already plan to introduce an E-Mount 30mm macro lens later this year. Still, we can hope that before too long Sigma and Tamron will both be offering E-Mount lenses that expand the options available to NEX users.
That both companies - the two biggest third party lens makers - believe there is money to made in developing and selling lenses for NEX and M43 suggests that they have plenty of confidence in the future of the mirrorless market.