Nikon MC-20 Remote Cord for Nikon F5, F100, F90X, F90, D1-Series cameras, In addition to normal shooting, you can perform long-time exposure with the long-time exposure mode. Also, when time mode is selected, the shutter opens and the time exposure begins with the first press of the shutter release button, and the shutter closes and the time exposure is terminated with the second press of the shutter release button. During time mode, the exposure time is displayed on the LCD panel.