“When using the M645 manual focus lenses, mount the exclusive viewfinder screen
#314474 (sold separately) and set the focus mode to “M” (manual) to enable shooting
with stop down metering.
1. Mount the M645 lens to the body, set the focus, then set the lens’ A/M lever to “M”.
Focus confirmation is given in the viewfinder’s LCD panel.
2. Select the exposure mode and set the desired lens aperture. (See chart below).
3. Half-press the shutter release button. The shutter speed is displayed”