>>1254544Carry your lightstand with you, but tape a piece of foam core to the front of it where your head will be. Get some heavily textured thing, paste it to the front of the foam core, color one side of it black and the other white to add contrast.
Perfect focus dummy.
This is assuming you're using an autofocus lens with a crappy focus scale- if the distances shown on the lens are accurate, just use a tape measure.