Nikon D3400 Reference Manual - English - Page 131

Long Time-Exposures (M Mode Only) Select the following shutter speeds for long time-exposures of moving lights, the stars, night scenery, or fireworks. • Bulb (A): The shutter remains open while the shutter-release button is pressed all the way down. Use a tripod to prevent blur. • Time (&): Start the exposure using the Length of exposure: 35 s Aperture: f/25 shutter-release button on the camera or on an optional remote control. The shutter remains open for thirty minutes or until the button is pressed a second time. Before proceeding, mount the camera on a tripod or place it on a stable, level surface. To prevent light entering via the viewfinder from appearing in the photograph or interfering with exposure, we recommend that you cover the viewfinder with your hand or other objects such as an optional eyepiece cap (0 268) before taking pictures without your eye to the viewfinder (0 68). To prevent loss of power before the exposure is complete, use a fully charged battery. Note that noise (bright spots, randomly-spaced bright pixels, or fog) may be present in long exposures. P, S, A, and M Modes 107