Bulb Exposures - Canon EOS 1D Mark III Instruction Manual

Bulb Exposures

When bulb is set, the shutter stays open while you hold down the
shutter button completely, and closes when you let go of the shutter
button. This is called bulb exposure. Use bulb exposures for night
scenes, fireworks, the heavens, and other subjects requiring long
exposures.
Since bulb exposures produce more noise than usual, the image will look
rough or grainy.
For bulb exposures, using Remote Switch RS-80N3 or Timer Remote
Controller TC-80N3 (both optional) is recommended.
When C.Fn II -1 [Long exp. noise reduction] is set to [1:Auto] or
[2:On], noise generated by the bulb exposure can be reduced. (p.163)
LCD Panel Illumination
U
102
Select "buLb".
1
Press the <W> button and turn
the <6/5> dial to select "buLb".
Set the desired aperture.
2
While looking at the top LCD panel,
turn the <6/5> dial.
Take the picture.
3
Press the shutter button completely.
The elapsed exposure time will be
displayed on the top LCD panel.
1: min. 2: sec. 3: hour
Each time you press the <U> button,
the illumination of the top and rear LCD
panels will turn on or off (9). During a
bulb exposure, pressing the shutter
button completely will turn off the LCD
panel illumination.