NancyP said:
16-35mm f/4 is lighter weight, better suited to a landscape lens where f/8 is the likely aperture and where your camera is likely on tripod.
Yeah, optically the 16-35 f/4L IS absolutely mops the floor with the 16-35 f/2.8L II. If you're in the market for an L zoom, it used to be an easy decision --
buy the f/2.8 to future proof for all possible applications. But the market is a shade more crowded now.
11-24 f/4L -- expensive and front-filtering is complicated/expensive; I see this lens being meant for interiors and architecture, but you certainly could shoot landscapes with it. If you need to shoot 11-14mm, this is your only (rectilinear) choice.
16-35 f/2.8L II -- it can technically do everything, but it just doesn't do it all brilliantly. So I see this lens as the 'devil you know' for an f/2.8 wide zoom use where AF has got to be first party rock solid -- up-close sports/action in particular.
16-35 f/4L IS -- landscapes landscapes landscapes. It does other things, but landscapers needed to change their shorts when Canon released this. It was a massive sharpness improvement, and you didn't need to carry f/2.8 lens weight around when you shoot f/8 - f/14 all the time. A stellar lens, and a stellar value.
17-40 f/4L -- this is your budget play, your first L lens, etc. Wide + Fairly sharp + sealed + well built --> is well suited for landscapes, but certainly could serve as a wider walkaround for those who like wider FOVs.
Tamron 15-30 f/2.8 VC (IS) -- a big, heavy tool, but it's very sharp, very wide, has f/2.8 and has IS. Front filtering is a handful as there are no threads, but like the 11-24 it can be done if you don't mind the trouble. Also, I seem to recall it's a workable zoom option for astro due to fairly well managed coma. This is a great overall value if you don't need first-party AF confidence or screw in filtering.
There's also an f/2.8 Tokina, but I've read nothing about it.
- A