Hands-on with Tamron's 24 / 35mm Di III OSD M1:2
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Hands-on with Tamron's 24 / 35mm Di III OSD M1:2

All three of the new primes feature 'front element focusing' which basically means that when the lenses rack from their nearest to furthest points, the front element moves within the lens, and the size of the lens does not change.

The 'OSD' (Optimized Motor Smart Drive) focus motors provide silent automatic focus, although on the a7III which we used, there is some noticeable 'wobble' as the lens finds its mark. This could be a pre-production issue (and it could be related to the horrible tradeshow light) but we'll reserve judgement until we receive final shipping samples.

This photo shows off the shallow petal-style hood of the 24mm F2.8, and the 67mm filter thread, which is common to all three lenses.