Canon is on the accelerator with RF mount lenses having just released the much anticipated 24-240mm superzoom which is now being followed by two L-series models – the RF 15-35mm f2.8L IS wide-angle zoom and the RF 24-70mm f2.8L IS standard zoom. These bring the current RF mount line-up to eight models with the next cab off the rank likely to be the RF 70-200mm f2.8L IS USM telezoom. Canon is promising ten RF lenses by year’s end.

Canon RF 15-35mm f2.8L IS. Photo: Canon.

The ‘IS’ suffix indicates built-in optical stabilisers which employ Canon’s latest ‘Dual Sensing’ technology so info from the camera’s sensor is also used to determine how correction for camera shake is applied. Canon claims up to five stops of compensation for each. Both zooms feature weather-proofed external constructions with a fluorine coating on the exposed surface of the front element to help better repel moisture and grease. Both lenses have the EOS R system’s multi-function control ring which can be assigned to set the aperture, shutter speed, ISO or exposure compensation.

The RF 15-35mm wide-angle zoom has a 16-element optical construction (in 12 groups) while the 24-70mm’s uses 21 elements (in 15 groups). Both employ three aspherical types and ultra-low dispersion elements – two in the 15-35mm and three in the 24-70mm. Autofocusing is performed via Canon’s ‘Nano’ USM drive which is optimised for videography.

Canon RF 24-70mm f2.8L IS. Photo: Canon.

The 15-35mm employs both Canon’s SWC (‘Sub Wavelength Structure Coating’) and ASC (‘Air Sphere Coating’) multi-coatings to minimise flare and ghosting. It has a minimum focusing distance of 28 centimetres, and weighs in at 840 grams. The minimum aperture is f22. The 24-70mm has the ASC multicoating. This model weighs 900 grams and also has a minimum aperture of f22.

Additionally, a significant firmware upgrade is on the way for both the EOS R and RP camera bodies, specifically adding important new capabilities to the autofocusing. These comprise eye-detection AF, an improvement to the way the AF frame display tracks the subject, and better subject recognition to enhance acquisition over longer distances.

Both new RF mount lenses will be available in Australia at the end of September, with local pricing yet to be announced. The firmware upgrade will be free. Visit http://www.canon.com.au