[Klaus]

Just out of curiosity I was wondering.
Could I get a manual 50mm (or whatever) lens that has already the canon mount, and get an adapter for the AF confirmation?
Would that need to be canon to canon adapter?

Well, if it has an EF mount already you can't add adapter - otherwise you lose infinity focus.

In theory you could get an AF chip off eBay and glue it to the mount. Sounds more complicated and bizarre than it is. I've seen that on Chinese lenses.

Whether this is worth it ... unlikely ...