Tamron has unwrapped a 10-24mm lens designed for Canon and Nikon digital SLR cameras that have a built-in AF motor.

The firm?s president Morio Ono described the optic?s 2.4x zoom ratio as ?unprecedented? in its class, adding that the lens is designed for DSLRs with an APS-C size imaging sensor.

The SP AF10-24mm f/3.5-4.5 Di II LD Aspherical (IF) delivers the 35mm viewing angle equivalent of a 16-37mm lens.

Features include a minimum focus distance of 0.24m and aspherical elements to help reduce distortion.

The lens will go on sale in Japan on 20 September.

A UK launch date and price have yet to be announced.

Pentax and Sony compatible models will be launched at a later date.

Tamron 10-24mm f/3.5-4.5