STOP-DOWN EXPOSURE MEASUREMENT
With some Nikkor lenses, full-aperture exposure mea- surement is not possible, either because the lens has no automatic diaphragm, or because the lens does not cou- ple with the built-in meter; with certain accessories, too, lens/meter coupling is not possible, thus, prevent- ing full-aperture measurement. However, the camera's meter can still be used for exposure measurement via the stop-down method. Before mounting the lens (or accessory) on the camera body, lock the meter cou- pling lever in the up position, as described in "Cou- pling Lever Lock/Release Operation" on page 43; the lever must remain up as long as stop-down measure- ment is being performed. After setting the lever, mount the lens or lens/accessory combination on the camera, switch on the meter by moving the film-advance lever to the standoff position (or moving the shutter-release button lock to the left), and then set the controls for correct exposure as follows:
For fixed-aperture lenses, such as Reflex-Nikkor lenses, choose the desired shutter speed operation mode (ei- ther automatic or manual selection) first. When auto- matic shutter speed selection is used, no additional set- tings are required; when manual speed selection is used, adjust the shutter-speed dial until the meter needles in the finder overlap. The exposure can additionally be controlled via built-in or accessory ND filters.
