Controls in detail ~ continued – Nikon FM2 User Manual
Page 27
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
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.
20