Stop-Down Exposure Measurement - Nikon FM2 Instruction Manual

Stop-down exposure measurement
This exposure measurement method is used when the dia-
phragm on the lens does not link with the meter coupling lever
on the camera body, such as when a non-AI lens or an exten-
sion ring is mounted on the camera. The procedure is as follows:
1) Set the ASA/ ISO number.
2) Compose your picture and·secure subject focus .
3) Press the shutter release button lightly to turn the meter on.
4) Perform exposure measurement, depending on the type of
lens used:
• Lens with automatic diaphragm
Determine the correct exposure while pressi ng the depth-
of-field preview lever
® ,
then take your finger off the lever
and depress the shutter release button .
• Lens without automatic diaphragm (PC -Nikkor lens)
First, determine the correct exposure by adjusting the
shutter speed and aperture. Then, focus at full aperture.
Shift the lens so that you get the desired composition. Re-
turn the aperture setting to the preset posi tion and shoot.
• Lens with fixed aperture (Reflex -Nikkor lens)
Exposure cannot be changed according to the aperture be-
cause in this type of lens, the aperture is fixed. Determine
the correct exposure by turning the shutter speed dial. If
correct exposure is unobtainable, use an ND (neu tral den -
sity) filter or change the illumination to adjust the exposure .
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