Tamron SP 150-600mm F/5-6.3 Di VC USD G2
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