We were biking around Boston, and two guys my wife knows came up on us, on their way to the waterfront to do some drone footage. One asked if he could take our picture with his "new rented camera." He pulled out an A7s with what looked like a 35 f1.4? on it... The two of them struggled to take a picture, having little familiarity with it. "Where's the ISO? Ok but then how do I control the aperture?" And then they looked for the aperture control for what felt like an eternity. Finally I said "hey I think that's a marked aperture ring on the lens guys," and they looked startled... "Oh yeah! Awesome!" And then they got a shot or two off. I guess they're used to modern DSLRs?