ADepth-of-Field Preview
To preview the effects of aperture, press and hold the depth-of-field preview button. The lens will be stopped down to the aperture value selected by the camera (modes P and S) or the value chosen by the user (modes A and M), allowing depth of field to be previewed in the viewfinder.
Depth-of-field preview button
ACustom Setting e4—Modeling Flash
This setting controls whether the built-in flash and optional flash units that support the Creative Lighting System (CLS; see page 276) will emit a modeling flash when the depth-of- field preview button is pressed. See page 228 for more information.
AAF Micro NIKKOR Lenses
Provided that an external exposure meter is used, the exposure ratio need only be taken into
#account when the lens aperture ring is used to set aperture.
A The Exposure Indicator
If a shutter speed other than “bulb” or “time” is selected, the exposure indicator in the viewfinder shows whether the photograph would be under- or over-exposed at current settings (if Lo or Hi is displayed, the indicators show the amount of under- or over-exposure). Depending on the option chosen for Custom Setting b2 (EV steps for exposure cntrl.,
0 211), the amount of under- or over-exposure is shown in increments of 1/3 EV or 1/2 EV (the illustrations below show the display in the viewfinder when 1/3 step is selected for Custom Setting b2). If the limits of the exposure metering system are exceeded, the displays will flash.
Optimal exposure | Underexposed by 1/3 EV | Overexposed by over 2 EV |
| | | | | | | | | | | |
| | | | | | | | | | | |
| | | | | | | | | | | |
| | | | | | | | | | | |
AReverse Indicators
If 
(V) is selected for Custom Setting f9 (Reverse indicators, 0 234), the exposure indicators in the viewfinder and information display are displayed with positive
values on the left and negative values on the right. Select 
(W) to display negative values on the left and positive values on the right.