Canon EF 70-200mm F/2.8L IS III USM vs Canon EF 70-200mm F/4L IS II USM — Which Is Better?

The Canon EF 70-200mm F/2.8L IS III USM is the stronger pick when you need to isolate a subject in dim light, because it keeps a bright f/2.8 aperture across the whole zoom range. The Canon EF 70-200mm F/4L IS II USM opens one stop smaller at f/4. Both are L-series full-frame telephoto zooms introduced in 2018 for Canon EOS cameras using the EF mount, so they fit the same bodies.

The F/4 IS II is the far lighter lens to carry, weighing 780 g against 1440 g for the F/2.8 IS III. It is also shorter and slimmer, at 176 mm long and 80 mm across, compared with 199 mm and 88.8 mm. That size gap matters for hiking, travel and long handheld sessions.

Both lenses take front filters directly, but their threads differ: 72 mm on the F/4 IS II and 77 mm on the F/2.8 IS III, so each needs its own filter size.

The F/2.8 IS III is the better choice for indoor sports, stage work and dim receptions, because its f/2.8 maximum aperture at every focal length gathers a stop more light than the F/4 IS II. If your subjects sit still, the F/4 IS II rewards you at close range instead, focusing to 100 cm against 120 cm and reaching 0.27x magnification versus 0.21x for tighter detail shots.

Both lenses share the same 70-200mm zoom range, autofocus with a manual focusing ring, and an internal zoom that avoids extending the barrel. The F/4 IS II has nine aperture blades, one more than the eight in the F/2.8 IS III.

The F/4 IS II is the steadier lens for handheld shooting of static subjects, with image stabilization rated at 5 stops against 3.5 stops on the F/2.8 IS III. That extra steadiness helps when photographing architecture or landscapes at slow shutter speeds without a tripod.

Day-to-day care and add-ons are shared ground. Both lenses have a fluorine coating that makes the front element easier to wipe clean of dust and smudges, both are weather sealed, and both accept teleconverters for added reach on distant wildlife.

The F/2.8 IS III uses a larger optical formula of 23 elements in 19 groups, against 20 elements in 15 groups for the F/4 IS II. Each design includes one low-dispersion element to help control chromatic aberration, and neither uses aspherical elements.