Canon EF 16-35mm F/2.8L II USM vs Canon EF 16-35mm F/2.8L III USM — Which Is Better?

The Canon EF 16-35mm F/2.8L II USM and Canon EF 16-35mm F/2.8L III USM are two generations of the same L-series ultra-wide zoom for Canon EOS full-frame bodies. Both cover a 16-35mm range at a constant f/2.8, so either serves the same jobs: sweeping interiors, architecture and tight spaces where you cannot step back. The II dates from 2007 and the III from 2016, and the newer generation carries the meaningful differences in this pairing.

The II is the lighter and shorter lens. It weighs 635 g against 790 g for the III and runs 112 mm long versus 127.5 mm. The 155 g saving and shorter barrel are the II's edge for a travel kit or weight-limited bag.

Filters transfer directly. Both take 82mm front filters, so a single polariser or ND purchase fits either lens.

Both lenses deliver the same framing and exposure. The shared 16-35mm range, constant f/2.8 and 28 cm closest focusing distance mean neither limits composition or close approach. The matching aperture keeps handheld work in dim interiors or evening streets on the same footing.

The III reaches a slightly higher maximum magnification, 0.25x against 0.22x for the II, so a close foreground subject fills a little more of the frame. It also has nine diaphragm blades to the II's seven.

The III's practical feature gain is a fluorine coating on the front element, which the II lacks. It repels dust and water droplets and makes fingerprints easier to wipe off, useful on a lens facing rain, sea spray and muddy hands.

The remaining features are shared. Both offer weather sealing for outdoor work, and neither has built-in image stabilisation, a zoom lock or teleconverter support, so steady technique carries the load either way.

The III has the more modern optical construction. Its 16 elements include three aspherical elements, two of them double-sided, plus two low-dispersion elements, against one aspherical and one low-dispersion element in the II's 16 elements. Those extras are the design tools for controlling distortion and colour fringing across an ultra-wide frame.

The III focuses internally, so its barrel does not extend while focusing, unlike the II. It arranges its elements in 11 groups rather than the II's 12.