Release mode controls what happens when the shutter is released.
Camera takes one photograph each time shutter release button is pressed.
Continuous low speed
While shutter-release button is held down, camera records 1–7 frames per second. * Frame rate can be chosen using Custom Setting d1 (CL mode shooting speed).
Continuous high speed
While shutter-release button is held down, camera records up to 8 frames per second. * Use for active subjects.
As for single frame, except that mirror does not click back into place while shutter-release button is fully pressed, allowing user to control timing of click made by mirror, which is also quieter than in single frame mode. In addition, beep does not sound regardless of setting selected for Beep options in the setup menu.
QC (quiet continuous) shutter-release
While shutter-release button is held down, camera records up to 3 frames per second. * Camera noise is reduced.
Take pictures with the self-timer.
Choose this mode to minimize camera shake in telephoto or close-up photography or in other situations in which the slightest camera movement can result in blurred photographs.