Nokishita leaked additional details about the Tamron 70-180mm f/2.8 Di III RXD FE:
19 elements in 14 groups
shortest distance is 0.85m (0.27m at wide end MF) Close-up photography possible
maximum shooting magnification 1: 4.6 (AF),1: 2 (MF)
filter diameter 67mm
9 aperture blades
size φ81x149mm
weight 810g
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Tamron 17-28mm f/2.8 Di III RXD FE: B&H Photo / Amazon / Adorama
Tamron 28-75mm f/2.8 Di III RXD FE: B&H Photo / Amazon / Adorama
Tamron 70-180mm f/2.8 Di III RXD FE: (Coming Soon): B&H Photo / Amazon / Adorama
via Nokishita