My human eye used to work that well. When I was a teen I used dead slot car motors for wire and made up turret baskets. Now days, 40+ years on, out comes a 3x power hood style magnifier for painting. I still prefer 6mm, mostly as I have lots. My weak point is terrain. I say as I look to my left at the stash of 1/2″ styrofoam sheet to be made into hills.