Tamron says it has improved several features on the second-generation model, including AF speed and accuracy, vibration compensation (now ‘4.5-stops’ equivalent) and ergonomics.
It has also added a fluorine coating designed to be oil and water repellent, and a Flex Zoom Lock mechanism to allow the zoom to be quickly locked or unlocked in any position by sliding the zoom ring.
The SP 150-600mm f/5-6.3 Di VC USD G2 is built from 21 elements in 13 groups and includes three low-dispersion elements.
The new lens is due to be launched in Japan, in Canon and Nikon versions, on 15 September. A Sony-mount model will follow at a later date.
A UK availability date and price have yet to be announced.
The original 150-600mm lens was launched in December 2013.