Nikon offers lenses designed and manufactured by Tamron
In September 2022, Nikon announced that it wanted to have a range of 50 Z mount lenses in 2024. Nikon presents the "new" Z 17-28mm f2.8 zoom.
This 17-28mm f2.8 Z zoom is actually a rebadged and reworked version of Tamron's 17-28mm F2.8 Di III RXD lens. Already the Nikkor Z 28-75mm F2.8 zoom was a version of the Tamron 28-75mm F2.8 Di III VXD just like the Nikon Z 70-300mm f/4.5-6.3 zoom from the Tamron 70-300mm f/4.5 -6.3 Di III RXD. These are rebadged zoom lenses and not original Tamron designs for Nikon.
To go quickly and enlarge its Z range by force, Nikon therefore takes existing zooms by applying a mark-up of almost 33% compared to the original lens.
A pragmatic but questionable process.
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Pierre J. 09-23-2022