l've been wanting to get these for about a year. Got the 58mm size to start out with. Later l'll get the 77mm. The 50 1.8G is 58mm. When shooting portraits with it, l can rapidly put on and take off a diffusion soft filter. Can also be used with the 85 1.8D with a 62-58mm step down adapter. And l can use my 58mm 10 stop ND with the Canon 15-45mm lens that's for my mirrorless M50. Just put on the 49-58mm step up adapter, Xume filter holder, and l can easily remove the ND for focusing and composing the shot.