lenscaps? When I get a lens I promptly put the lens cap in a drawer and there it stays! Problem with Rf's is that you can happily shoot with the lenscap in place.
A famous Swedish pressphotographer was once selected to shot the Official portrait of the Swedish King at his 80's birthday. The king suggested some pictures in the rose garden and started doing pirouets and dance steps as well as strange facial expressions. The photographer thought "Pulitzer, Press awards and eternal fame". Once he got through his first film in his M and started to rewind his camera, the king leaned over and said "Oh, far be it from me to tell you how to take pictures - but dont you remove that cap over the lens first"! Of, course, after that he posed regally and properly for the whole session.