With olympus bringing out more lenses with the manual focus clutch mechanism (e.g. 12mm, 17mm, 12-40mm), I feel there should be an in camera option to disable the use of this mechanism. There's been a couple times I've handed my EM5 + 17mm to someone else to use, and they've accidentally engaged the manual focus mechanism and have then proceeded to take blurry out of focus photos. I've also noticed a few people post who were befuddle with their lens and wonder why it only manual focuses (because the manual focus ring is engaged). Perhaps it should be something that is disabled by default? I'm not complaining about the mechanism, I like how it feels when using it... but I think there should be an option to disable it.