For automatic diaphragm lenses with no coupling ridge,
first set the shutter-speed dial for either automatic or manual shutter speed selection. When using automatic, next depress and hold the depth-of-field button to stop- down the lens diaphragm and adjust the aperture ring until the black needle indicates the desired shutter speed; then, while holding the button depressed, press and hold the memory lock until the completion of the ex- posure. When using manual operation, select the desired shutter speed, depress and hold the depth-of-field but- ton, and (while holding the button depressed) adjust the aperture ring until the meter needles in the finder over- lap. Whichever mocle of operation used, be sure to re- lease the depth-of-field button prior to making the ex- posure.
For bellows units, extension rings and preset lenses, set the camera to the desired shutter speed (or to auto- matic); then, stop down the lens manually until the me- ter needles in the finder overlap (or the desired shutter speed is indicated); when using automatic shutter speed selection, it may be necessary to press the memory lock if the aperture is to be re-opened for focusing and/or composition. Preset-type lenses include PC-Nikkor lenses.
