The 150-600mm telezoom lens has come into its own in recent years. Tamron came to the party first, with its affordable SP 150-600mm f/5-6.3 Di VC USD ($1,069.00 at Amazon) , but was quickly joined by Sigma, which released consumer and pro-grade versions of its 150-600mm simultaneously. The Tamron SP 150-600mm f/5-6.3 Di VC USD G2 ($1,399) isn't a replacement for its first take. Instead it's a pricier, sturdier, more refined optic, complete with an all-weather build and incredible image stabilization system. We're sticking with the Sigma 150-600mm DG HSM Contemporary ($1,069.00 at Amazon) as our Editors' Choice, but if your shooting needs call for work in heavy rain, consider the Tamron G2 as an alternative. Design Like other 150-600mm designs, the Tamron G2 ($1,069.00 at Amazon) is a big lens that extends when zoomed beyond the 150mm point. It measures 10.2 by 4.3 inches (HD) and weighs 4.4 pounds. It's in line with the Sigma 150-600mm Contemporary (10.2 by 4.1 inches, 4.3 pounds)...
The Tamron SP 150-600mm F/5-6.3 Di VC USD G2 lens has some edge sharpness issues, but is an overall solid performer, especially when paired with an APS-C SLR.
Strong sharpness through most of range; Excellent stabilization system; Quick autofocus; Lockable zoom mechanism; Rotating tripod collar; Integrated Arca-Swiss foot; Weather-sealed design; Available for Canon, Nikon, and Sony SLRs
Weak edge performance at wide and telephoto extremes; Teleconverter use limits autofocus operation