They fit on the EF 28mm 1: 1.8, but only sluggishly. One must of course respect the red dot and press when applying only a bit before getting screwed. Instant screws, as you know it from a bottle, leads me to wedge. And even if one sets properly, you need a few attempts. I hope I did carry out enough time and energy, this fumbling during shooting. Perhaps we could have the plastic indulge a little more game.
