This is one of Canon’s first RF mount lenses, designed from the ground up to be paired with Canon’s new EOS R System. The first camera belonging to this system is the EOS R, Canon’s first full frame mirrorless camera. The Canon RF 28-70mm F2 L USM is a world’s first. It is the first full frame zoom lens with autofocus that has a constant f/2.0 aperture.
Canon’s new RF mount has enabled their engineers to place the rear element of lenses closer to the camera’s sensor. This means they can produce lenses that don’t have to bend light as far and therefore can produce lenses with even better optical qualities, particularly towards the edge of the frame. The mount’s new 12 pin connection offers faster and more complex communication between the lens and the body.
This is an astonishing lens that really displays the kind of things Canon can do with the new RF mount. Even more astonishing is that fact that wide open at f/2.0, this lens is able to render images that rival the EF 24-70mm f/2.8 at f/2.8. It is effectively providing similar performance to four prime lenses, all in one body.
All of this performance doesn’t come without a price, the RF 28-70mm F2 L USM weighs in at a hefty 1.4kg but the new RF mount has allowed engineers to keep its size and weight balanced and comfortable.
The lens contains 4 Aspherical elements (AS) to help control distortions and aberrations like astigmatism. It also includes one 2 Ultra-low Dispersion elements (UD) and one Super UD element that helps control Chromatic Aberration (CA). The result achieves brilliant quality right across the frame.
Due to its size, the filter thread is 95mm
Customisable Control Ring
Each of Canon’s RF lenses comes equipped with a new customisable control ring. The ring can provide control over aperture, shutter speed, ISO or exposure compensation. It is customisable from the camera. The control ring is textured differently, so is easily identified by touch.
Canon L Quality
As you’d expect from canon’s professional line of lenses, the quality of this 50mm F/1.2 lens is excellent. It is weighty and beautifully engineered, built for the demands of professional use. It is dust, water and vibration shock resistant. Both exposed elements have a fluorine coating to help repel dust, moisture and oil.