I just tried fitting the S/booster on the Gh4 and it is so TIGHT that it's making me nervous. I don't want to wrench it on. What is the general experience with fitting S/B to GH4? Do I have a dud?
That's just Metabones. Both my SpeedBoosted and non-boosted m43 adapters are exceptionally tight-fitting on my AF100 (not as much on my GH2). They've never gotten stuck, but they take slightly more oomph to rotate into position.
Bonus side effect, though, is that I'm certain there's no adapter play on the camera side.