A quick headsup with the Viltrox adapter. Years ago, I hacked a Canon 10-18mm to make it fit, which it did. However, one day, I took it out my bag and was getting some really crazy lens flares. Turned out, the back lens element was touching the glass in the adapter when at around 12mm. In my bag, it cracked the glass in the Viltrox, and I learned there's a pretty good reason the combo didn't work without being hacked.
So if you get any EFs lenses, be careful - or you'll end up with a one of a kind, megaflare adapter (I've used it a few times since because of the 'creative flaring', so it's not all bad)
This photo is from the moment I noticed something was wrong. Luckily, it was on my GX85 at the time, which I was using for behind the scenes stills. So nothing was lost or ruined in a 'professional' sense.