What is bulb (B) mode?
Camera shutter times are normally specified in fractions of a second. Taking pictures on a sunny day, for example, can easily mean extremely brief exposures of 1/60 to 1/1000 of a second. But what if you want to take really long exposure photographs – perhaps several minutes – at night? Most cameras don t have a way to dial in extremely long (longer than 30 second) exposures. Instead the camera has what is known as bulb mode. To enter this mode on most EOS cameras you set the camera to manual metering (M) and then set the shutter speed to buLb , which is usually the setting past 30 seconds. With some cameras you set the camera to B mode. Either way, in this mode the shutter will remain open for as long as you keep the shutter release button pressed down. You then set a stopwatch or something and time the exposure manually. More conveniently, some recent EOS bodies have a top-deck timer so you just need to turn on the LED backlight and you can watch the seconds tick by. There are three
