Dpreview had a chat with Tamron managers and here are some of the info they shared:
Next FE lens:
People really want a telephoto zoom to cover focal lengths longer than 75mm. We’re looking [into] that.
About future Canon RF and Nikon Z lenses:
Yes, we’re also looking at that area. We have to do a lot of research and development into the reverse engineering, because they don’t disclose the details of their systems, so it’s a really hard job for us.
APS-C vs Full Frame:
APS-C is still important to us, but when we think about the [industry], the full-frame market is expanding, so we’re looking at that market first – that’s the first priority. So gradually we’ll create a [full-frame] line and then at another time we can launch more APS-C lenses. The APS-C market is shrinking quite fast.
The APS-C market is shrinking, and Tamron would be irresponsible to pour significant resources into developing lenses for a contracting market. The audience for lenses designed for full-frame mirrorless, on the other hand, is guaranteed to grow over the coming years. With two FE lenses for Sony already on the market, it was reassuring to hear from Tamron’s executives that longer focal lengths are being planned, to round out the lineup.
Next, of course, will be reverse-engineering lenses for the Canon RF and Nikon Z mounts (it seems unlikely that Tamron will bother with L-mount given Sigma’s head start as a member of the alliance). In our conversation, Tamron’s executives reinforced what we’ve been told by other optical engineers (including Sigma’s Kazuto Yamaki) that designing for a longer flange back distance and adapting that design to shorter mounts is the only practical way to create one optical formula for several mounts. As such, it seems possible that before too long, the popular Sony FE-mount 28-75mm F2.8 might form the basis of new standard zooms for Canon and Nikon mirrorless.