Support BladeForums! Paid memberships don't see ads! You have to assume there is convexity proportional to the amount of material deflection. If that deflection is very slight, as with a waterstone, hardwood strop, frosted glass, the edge will actually fold away from the pressure rather than grind into a convex, based on the amount of pressure, approach angle and grind rate. So somewhere in the mix is a bunch of variables that have the edge deflect, grind into a micro, convex from the curve of the strop material. You have to spell out the variables before talking about effects. If you're talking about an average leather strop I'd say for sure there is plenty of microconvexing. There's even going to be some off of lapping film.