Canon has unveiled its widest RF zoom lens, the RF 10-20mm f/4L IS STM, the first L series lens to feature STM motor and full-time manual focus capability.

Angled view of the new RF 10-20mm f/4L IS STM lens. (Source: Canon.)

Built for professionals, at just 570 grams, the new lens is less than half the weight and 2 cm smaller in width and length than the existing EF 11-24mm f/4L USM lens. Its optical design contains 16 elements in 12 groups and includes aspherical, Super UD and UD lens elements (including one Aspherical UD element) to minimise common aberrations. It also features the latest Peripheral Control Image Stabilisation (IS) technology for shake-free images when shooting hand-held, even in challenging conditions. Up to five stops of optical stabilisation are claimed for the lens or six stops of correction will be available when the lens is fitted to an in-body stabilised camera. The advanced rectilinear optical design means straight lines remain straight, even at the edges of the frame. The constant f/4 maximum aperture provides consistent exposures at every zoom setting, while SWC (on 2 lens surfaces) and ASC (Air Sphere Coating) optical coatings minimise ghosting and flare.

The new lens is also dust- and moisture-resistant and the step[ping motor ensures near silent operation while shooting video. The RF 10-20mm f/4L IS STM lens is priced at AU$4,199 (including GST). Available in Australia from this month, the lens will be supported by Canon Australia’s 5-year warranty when purchased from an authorised Canon Australia reseller. Click here for full details of the new lens.