The 70-180mm f/2.8 is the third and final lens of Tamron’s quirky version of the so-called “holy trinity” of f/2.8 zooms. There is the 17-28mm f/2.8 Di III RXD, the 28-75mm f/2.8 Di III RXD, and now the 70-180mm f/2.8 Di III VXD.
Tamron is calling this lens “the lightest and most compact f/2.8 telephoto zoom in its class”—a title it can easily claim thanks to the shorter 180mm maximum focal length and its extending zoom mechanism. It uses the same 67mm front filter thread as the 17-28 and the 28-75, weighs in at just 28.6oz (810g), and measures just 5.9 inches (149mm) in length at the 70mm setting.
The lens features 19 lens elements in 14 groups, including 1 extra-low dispersion (XLD) element, 5 low dispersion (LD) elements, 1 glass-molded aspherical (GM) element, and 2 “hybrid” aspherical elements. All of these, paired with the second generation Broad-Band Anti-Reflection coating, promise exceptional image quality from edge-to-edge at every focal length, even wide open. In terms of autofocus, the “VXD” in the lens name refers to Tamron’s first ever linear motor: a Voice-coil eXtreme-torque Drive motor (VXD) that is allegedly faster and more precise than previous iterations. And the 70-180mm lens actually uses two of these motors working in concert to allow for optimal image quality throughout the zoom range, even at the minimum focus distance of just 33.5 inches (~85cm).
Finally, as with the other lenses in the Di III lineup, the Tamron 70-180mm f/2.8 is moisture-resistant, features a fluorine coating on the front element to repel oil and water, and, since the lens does extend during operation, there’s also a zoom lock switch to keep it from expanding during transport.
Here’s a closer look at the lens;
And a few sample images from Tamron:
The Tamron 70-180mm f/2.8 Di III VXD will cost just $1,200 when it hits the market hopefully in May but Tamron cautions that “the release date or product supply schedule could be delayed” due to the spread of COVID-19.
