Canon EOS-1D Mark IV - Manual (Page 116)

Bulb Exposures
When bulb is set, the shutter stays open as long as 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.
b u L b
b u L
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ONE SHOT I
Set the shooting mode to <buLb>.
• Press the <MODE> button and turn
the <^/Q> dial to select <buLb>.
Set the desired aperture.
• While looking at the top LCD panel,
turn the <!?S/0> dial.
Take the picture.
• Press the shutter button completely.
► The elapsed exposure time will be
displayed on the top LCD panel.
1: min., 2: sec., 3: hour
Since bulb exposures produce more noise than usual, the image might look
a little grainy.
E|]
• When [.P.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.214).
• For bulb exposures, using the Remote Switch RS-80N3 or Timer Remote
Controller TC-80N3 (both sold separately) is recommended.
# LCD Panel Illumination
116
Press the <:.&}> button to turn on (¡2)6)/
off the illumination of the top/rear LCD
panel.
During a bulb exposure, pressing the
shutter button completely will turn off the
LCD panel illumination.