Canon RF 14-35mm F/4L IS USM vs Canon RF 15-35mm F/2.8L IS USM — Which Is Better?

The Canon RF 14-35mm F/4L IS USM and the Canon RF 15-35mm F/2.8L IS USM are wide-angle zooms for the Canon EOS R system, both carrying Canon's L branding with full-frame coverage. Either lens serves as a premium wide zoom for landscapes, architecture and interiors.

The 15-35mm is the older and faster lens, arriving in 2019 with a constant f/2.8 maximum aperture. The 14-35mm followed in 2021 with an f/4 maximum aperture and a 14 mm wide end, trading speed for width.

The 14-35mm is the clearly lighter and more compact option for travel and hiking. It weighs 540 g against 840 g, a 300 g difference, and measures 99.8 mm long against 126.8 mm.

Both take front filters at different thread sizes, 77 mm on the 14-35mm and 82 mm on the 15-35mm, so existing 77 mm polarisers or ND filters fit the lighter lens directly. Both share the Canon RF mount, so either fits the same EOS R bodies.

The 15-35mm is the stronger choice for light-gathering speed, holding f/2.8 across the whole zoom range while the 14-35mm stays at f/4. That wider aperture lets you hold faster shutter speeds handheld in dim interiors, evening streets and event work.

The 14-35mm answers with width and close focus. Its 14 mm start gives a slightly wider view than 15 mm for tight interiors. Closest focus is 20 cm against 28 cm, and maximum magnification is 0.38x against 0.21x, useful for near-macro wide detail.

Both lenses bring the same protection and stabilisation. Each has weather sealing for shooting in rain or dust, a fluorine coating that helps shed water and smudges from the front element, and built-in image stabilisation.

The stabilisation rating favours the 14-35mm, 5.5 stops against 5 stops, a small edge for handheld static scenes in dim light. Neither lens offers a zoom lock or teleconverter compatibility.

Their optical construction matches closely. Both use 16 elements in 12 groups, with three aspherical elements each to correct distortion and other aberrations, and both extend the barrel while zooming rather than focusing internally.

They differ in low-dispersion element count, three against two in favour of the 14-35mm. Low-dispersion glass reduces chromatic aberration, which can appear as colour fringing on high-contrast edges.