Does anyone know what Sony's long term plan is for making the A mount system cameras? I just called Tamron to order the new SP 70-200 Di VC (g2) and was told there is no version for Sony available. In fact they have a new 10-24mm lens as well that's due to come out soon. However; there will be no version for Sony available.
I don't want to invest thousands of dollars into another dead system.
Normally, these kinds of threads are standard fare trolling, but I checked you out, and given that you appear to have invested in the NX1 and gotten burned, I'm going to cut you some slack.
NO! A mount isn't dead - far from it. Two bodies released in the last 8 months - A68 value APS-C and A99ii - a do everything FF body. Many of us suspect release of an A77iii this Spring or Summer (but that's just speculation and we have no real information about that).
Tamron almost always releases lenses for A Mount last. That said, Sigma is not releasing any new lenses, although they admit that they have been deluged by requests, since the release of the A99ii. The A99ii has generated intense interest, is backordered all over the world, and in our admittedly biased evaluation, offers a combinations of functional abilities unmatched in the FF (or for that matter ILC) world.
In terms of your opening inquiry, the existing Tamron 70-200 USD (readily available in A mount) is a superb lens (I own it), better in my estimation than the Sony G2 70-200. The white Minolta 80-200 HS G is a superb lens as well, readily available for $800 or so used.
What are you looking to do with a camera?
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Sony A99ii-A77ii-RX10III-RX100III
Sigma: 8-16 f4.5-5.6, 500 F4.5 EX DG APO
Tamron: 70-200 f2.8 USD
Sony ZA: 24 f2, 85 1.4, 135 1.8, 24-70 2.8 SSMII
Sony: 16-50 f2.8, 100 f2.8M, 70-400 f4-5.6 G2
Minolta: 600 f4, 70-210 f4 ('Beercan'), 28-135 f4-4.5 ('SH')
DFW