Tamron released the first firmware upgrade on three lenses which makes them compatible with Nikon Z cameras. Here is the press text:
Dear users and potential purchasers of Tamron interchangeable lenses.
Thank you for using Tamron products and for your continuous support.
We would like to announce that new firmware versions are now available for the following three Tamron models. The new F/W versions make the three models compatible with Nikon Z7 and FTZ adapter for general operations(*1).
This is an update announcement of our October 4th compatibility notice with some of Tamron Di/Di II series for NIkon mount models not operating properly on Nikon Z7 and Nikon Mount Adapter FTZ.
(*1) Functions used on DSLR cameras
SP 70-200mm F/2.8 Di VC USD G2 (Model A025) for Nikon
SP 150-600mm F/5-6.3 Di VC USD G2 (Model A022) for Nikon
17-35mm F/2.8-4 Di OSD (Model A037) for Nikon
The lens firmware can be updated with the separately sold TAP-in Console.If you do not have a TAP-in Console, please contact your nearest Tamron distributors.
For a list of Tamron distributors, click here.
Lens Update Service Information
How to Update
For other models, once we confirm the compatibility with Nikon Z7 and FTZ adapter, we will announce the models sequentially at our support website.
We are sorry to keep you waiting, and also ask for your understanding of the situation.