Using Dr. Schneck's Minolta camera and copy stand, set
ASA to 125. Expose film according to meter reading; usually at F16 (to
get most depth with gross sections) the meter will read 1/4 to 1/8 sec.
Bracketing 1 speed on either side of this reading indicates that the
meter reading is usually the best. If anything, err on the dark side,
i.e. shoot 1 speed faster.