The previously rumored Tamron SP 24-70mm f/2.8 Di VC USD G2 lens will be announced this week (June 22nd) and the first pictures already leaked online:
The filter size of the new lens will be 82mm.
A new Tamron 18-400mm f/3.5-6.3 Di II VC HLD lens for APS-C based DSLR cameras will be announced together with the 24-70mm f/2.8 DI VC USD G2.
Via Nokishita
