Building on the earlier suggestion, i'd actually suggest looking at the Canon Control Ring Mount Adapter EF-EOS R instead of the base model mentioned earlier. Its honestly worth the extra cash because it gives you that extra control dial like native RF glass has, which is a total lifesaver for fast ISO changes during ceremonies. Ngl, id be pretty scared to use something like the Meike MK-EFTR-A Auto-Focus Mount Adapter for a paid gig. You gotta be really careful with the pin alignment on those off-brands. If the mount has even a tiny bit of play, your autofocus might just flake out at the worst moment. Just a quick tip... if you stick with official gear, you wont have to worry about firmware updates breaking your lens communication. Better to play it safe when people are paying you for results.

Unfortunately, the Meike MK-EFTR-A Auto-Focus Mount Adapter had terrible tolerances and felt way too flimsy for my heavy L-series glass. I was pretty bummed when the electronic pins lost contact mid-shoot last fall. If you're trying to save cash, just grab the Commlite CM-EF-EOS R Mount Adapter. It's usually half the price of the Canon and actually stays connected. Its honestly the only budget option I trust.

To add to the point above: I really wish the third-party market was more reliable, but unfortunately, my experience with off-brand adapters has been pretty disappointing for professional work. A few cheaper ones I tested last year had nonexistent weather sealing, which is a huge risk when you're shooting weddings outdoors. The decision to invest in the Canon Drop-In Filter Mount Adapter EF-EOS R with Variable ND Filter was tough on the wallet, but the performance is identical to native glass. That internal VND is honestly incredible because I dont have to mess with screw-on filters when the lighting shifts during a ceremony. Most of the budget options I tried had this tiny bit of play when using heavy glass like the Canon EF 70-200mm f/2.8L IS III USM, and that slight wobble eventually leads to communication errors. Stick with the official Canon hardware for your paid gigs so you dont have to worry about the gear failing you in the middle of the vows... it's just not worth the stress.

Stick with the Canon Mount Adapter EF-EOS R for those weddings. I watched a budget mount lose contact during a ceremony once and it was a nightmare. You cant risk glitches while working.