Nikon FM2 User Manual download pdf (Page 27)

CONTROLS IN DETAIL ~ continued

Setting the aperture

The lens aperture determines the amount of light reaching the

film plane. Generally, when you turn the aperture ring one

graduation in the direction of the larger numbers, the amount is

reduced by 1/2. (This is what stopping down by one graduation

means.) On the other hand, when the aperture ring is turned one

graduation in the direction of smaller numbers, the amount of

light is doubled. (This is known as opening the aperture by 1

stop.)The lens aperture ring clicks at the position of the numbers

engraved although intermediate lens apertures are usable con

tinuously. Lens aperture greatly affects depth of field (see page

28). With the exception of a few special lenses, Nikkor and

Nikon Series E lenses enable full-aperture light measurement

even when the aperture ring is moved. These lenses, which are

said to have an automatic diaphragm, stop down to the set

aperture only at the instant the shutter release button is

depressed.

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Nikon FM2 User Manual Page 27