The Tamron 28-75mm f/2.8 Di III RXD FE is back in stock at Amazon and should follow at B&H Photo and Adorama. It truly is a great lens for the price and I have used mine for Astrophotography and Portraiture so far and love the results. If you want a versatile high quality zoom the Tamron is currently unbeatable on a Sony a7RIII.
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Tamron 28-75mm f/2.8 Di III RXD FE: B&H Photo / Amazon / Adorama