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Fred Miranda wrote:
Is the UV filter for protection? The 16-35mm f/2.8L II is weather sealed. I would go without it. Adding another glass to your lens may increase the likelihood of ghosting/flare on your shots. Even if you scratch/break the front element, it's not expensive to replace it.
I second this. My UV filter saved my old 16-35L I after strong winds knocked over my tripod.
I've got the 16-35 L II lens now and haven't had any issues with vignetting with a full frame camera when used with the thinner profile filters like the B+W XS Pro, Heliopan SHMC, Rodenstock HR and the Hoya HD without any issues (all four of these have front rings, so you can still attach the lens cap. My preference is for the B+W and Heliopan, for the following two reasons:
1) I found the Hoya HD very hard to clean (lots of smudging)
2) When attachd to my Lee Wide angle hood, the adapter ring binds to the Hoya filter ring.
Optically all are excellent and are multi-coated, the B+W and Heliopan use Schott glass.
THere are many thin filters, but some don't have front filter threads, so you can't attach you lens cap. All four filters i've listed will accept the lens cap.