I had to cut the little depth of field preview lever off the back of some of my Rokkor lenses, because it was hitting something on the Metabones speedbooster. A bit of a shame, but I didn't think it was such a big deal as I think I don't think I want to resell any of them. And obviously it doesn't affect the performance of the lens on a NEX camera. But lately I have been thinking about buying a Minolta film camera (maybe an SRT101?) to play around with. If I use these lenses with the lever cut off, will they still meter properly? How is the lens supposed to behave on a film camera? Is it normally wide open for composing, and then stopped down when you either press the depth of field preview button or the shutter? If that is true, I guess I would have to meter wide open, select a shutter speed and then stop the lens down.