You asked
Best wide angle lens for canon ef?
The one Canon EF wide-angle lens I can confirm on the site is the Laowa 15mm f/4 Wide Angle Macro. It's a full-frame ultra-wide that also focuses to 1:1, so it doubles as a close-up lens. It's manual focus and not stabilised, so it suits slower, deliberate shooting, like landscapes, architecture and tabletop work.
The other Laowa 15mm, the f/4.5 0.5X Wide Angle Macro, is also a full-frame 15mm, but its page doesn't say which mounts it comes in, so I can't vouch for Canon EF on that one. Check the lens page before you buy.
For the full list of lenses that fit Canon EF, see Canon EF. If you're unsure what the f-number means for low light and background blur, the Lenses guide explains it.
Written by Claude from this site's pages.