Tamron recently issued a press release that the new 17-28mm f/2.8 Di III RXD lens for Sony full frame mirrorless cameras is currently in short supply. This means if you pre-order now through B&H Photo Video/Adorama/Amazon/Focus Camera, you may not able to get yours on July 25th, 2019 (Release date).
From Tamron Japan:
Thank you very much for your continued patronage of Tamron products.
The new product “17-28 mm F / 2.8 Di III RXD (Model A046)”, scheduled to be released on July 25, 2019, has a reservation significantly exceeding our expectations , It is predicted that the production number will not catch up with the customer’s request.
We sincerely apologize for the inconvenience caused to the parties concerned, including customers who are waiting for the release of the product.
Delivery to some customers who have already made a reservation may be after the release date. In addition, customers who will be making reservations in the future will also be delivered one by one, so it may be time to deliver the product.
We will do our best to deliver as quickly as possible, so we ask for your understanding.