Nikon D3400 Reference Manual - English - Page 130

2 Choose aperture and shutter speed. Checking the exposure indicator (see below), adjust shutter speed and aperture. Shutter speed is selected by rotating the command dial (right for faster speeds, left for slower). To adjust aperture, keep the E (N) button pressed while rotating the command dial (left for larger apertures/lower f-numbers and right for smaller apertures/higher f-numbers). Shutter speed Aperture Command dial E (N) button Command dial A The Exposure Indicator If a type E or G lens is attached (0 252) and a shutter speed other than "Bulb" or "Time" is selected (0 107), the exposure indicator in the viewfinder and information display shows whether the photograph would be under- or over-exposed at current settings. Optimal exposure Underexposed by 1/3 EV Overexposed by over 2 EV 106 P, S, A, and M Modes