Do the adapters come in 86mm?
Just curious, because I've got some MF glass, a 50mm f/4 (is about as wide as a 24mm on FF), with 86mm threads. Step-rings down to 72mm or smaller don't vignette even on FF, but one day when I buy an MF body i'm going to invest in a good filter system too.
Or what's the next size above this kit?