Originally posted by reh321 If you get enough subject speed, mechanical shutters can still give problems.
Indeed, that is the classic case and nothing has changed. The term "rolling shutter" is fairly recent and refers capture anomaly caused primarily by how digital sensors are managed with regard to so-called electronic shutters, but the principle is the same.
I am not sure, but I believe that many leaf shutters have issues with rotary fan blades as do focal plane shutters. I could test, but my leaf shutter lenses at present are all for the view camera. OTOH, I do have an unfinished roll of 120 in one of my film holders
Steve