Quote Originally Posted by qualsound View Post
what i still don't know is which bar (number) on the step wedge (either 21 or 31) represents medium gray...so that i could take a spotmeter reading off of that to determine expousre...
'Middle grey' by definition is the center of the range of densities, the midpoint between 'black' and 'white'. So on the 21 step wedge it would be #11 (plos and minus 10 steps to either side), and on the 31 step wedge it would be #16 (plus and minus 15 steps to either side), logically speaking!

So try spotmetering that step!