Canon RF 15-35mm F/2.8L IS USM vs Canon RF 24-70mm F/2.8L IS USM — Which Is Better?

The Canon RF 15-35mm F/2.8L IS USM and the Canon RF 24-70mm F/2.8L IS USM are sibling 2019 L-series zooms for the Canon EOS R system, both covering full frame with a constant f/2.8 maximum aperture. That shared brightness lets either lens keep shutter speeds usable indoors, from dim receptions to evening cityscapes, without changing aperture as you zoom.

The 15-35mm is the lighter carry at 840 g, against 900 g for the 24-70mm, a 60 g difference for the bag. Lengths are practically identical, with the 15-35mm 1.1 mm longer, and both share the same 88.5 mm diameter.

Both lenses take the same 82mm front filters, so one polariser or ND set fits either without stepping rings. Each supports front filter attachment directly.

The 15-35mm is the pick when the scene itself is the subject, reaching a 15mm wide end for architecture, interiors and sweeping landscapes. The 24-70mm answers with a 70mm telephoto end for tighter portraits, candids and detail shots, where the 15-35mm tops out at 35mm.

For close work the 24-70mm focuses to 21 cm against 28 cm, and it delivers 0.3x maximum magnification versus 0.21x on the 15-35mm. Both use nine diaphragm blades and offer autofocus with a manual focusing ring for fine control.

Image stabilisation is a shared strength, with both lenses offering 5 stops, which helps handheld shooting in low light with either focal range. Both have weather sealing for outdoor work, and fluorine coatings on both front elements make fingerprints and water spots easier to wipe away.

One difference favours the 24-70mm for travel: it has a zoom lock, while the 15-35mm does not. Locking the barrel stops the lens extending on its own while carried on a strap or in a bag.

The 24-70mm carries the more complex optical path, with 21 elements in 15 groups including three low-dispersion elements. The 15-35mm has 16 elements in 12 groups with two low-dispersion elements, while both designs use three aspherical elements.

Neither lens uses internal focusing, so the barrel moves as focus changes on both. Both zoom by a rotary extending ring, which keeps handling familiar when swapping between them.