A Photographer posted an album with some new Tamron 70-300mm f/4.5-6.3 Di III RXD photos which you can see here. Further I am told it balances very well on the Sony a7III. The new Tamron is looking it it will be a great lens.
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Tamron 70-300mm f/4.5-6.3 Di III RXD: B&H Photo / Amazon / Adorama