You choose both the aperture and the shutter speed. Manual mode even offers a shutter speed of "bulb" for long exposures. Because you control both aperture and shutter speed, manual mode offers great scope for expression. But choose the wrong combination and your photo will be too bright or too dark, or in other words over- or under-exposed. Keep your eye on the exposure indicator when choosing aperture and shutter speed.
01. Press the mode dial lock release and rotate the mode dial to M.
1. The mode dial lock release
02. While the exposure meters are on, rotate the main command dial to choose a shutter speed. Shutter speed can be set to “x200” or to values between 30 s and 1/4,000 s or the shutter can be held open indefinitely for a long time-exposure (Bulb).
03. Rotate the sub-command dial to set aperture. Aperture can be set to values between the minimum and maximum values for the lens.
View information on functions related to Exposure Mode: Mode M (Manual).