Tamron is planning to announce a third full-frame mirrorless lens for Sony E-mount with a focal length longer than 75mm. Tamron currently has the 17-28mm f/2.8 and 28-75mm f/2.8 lenses for Sony E-mount. Here is a quote from a recent interview:
The 17-28mm F2.8 Di III RXD is the second of your full-frame Sony E-mount lenses – do you have plans for more?
Yes of course. People really want a telephoto zoom to cover focal lengths longer than 75mm. We’re looking [into] that.
The new lens will most likely be introduced next year since Tamron already confirmed in another interview that they are working on only 3 new lenses for 2019.
Via Dpreview
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