You asked
Best wide angle lens for the canon eos r6 mark ii?
For a wide angle on the Canon EOS R6 Mark II, my first pick is the Canon RF 15-35mm f/2.8L IS USM. It's a constant f/2.8 zoom, so the exposure stays the same as you zoom, which helps in dim interiors and at events. If you want something lighter, the Canon RF 16mm f/2.8 STM is a simple prime for everyday walking-around shots.
For a wider view and a faster lens, look at the Canon RF 14mm f/1.4L VCM. It's ideal for astro and dim interiors, though it's a specialist choice. The Canon RF 16-28mm f/2.8 IS STM is another option if you want a zoom.
New to lens terms? The Lenses guide explains what the f-number means for light and background blur.
Written by Claude from this site's pages.