How to set long (bulb) exposures on the EOS 10D

Article ID: ART104926 | Date published: 05/11/2015 | Date last updated: 08/15/2015


How to set long (bulb) exposures on the EOS 10D


When bulb is set, the shutter is open during the time you keep pressing the shutter button fully. Bulb is useful when a long exposure is necessary for capturing night scenes, fireworks, the night sky, etc.

Set the Mode Dial to <M>.

Set the shutter speed to "buLb ".

  • Look at the LCD panel and turn the <> dial to select "buLb ".
  • The next setting after "30 " is "buLb ".

Set the aperture.

  • Turn the <> dial to set the desired aperture.


  • Press and hold the shutter button down fully.
  • The LCD panel will show the elapsed exposure time from 1 sec. to a maximum of 999 sec.
  • Exposure continues as long as you hold down the shutter button

Since bulb exposures will have more noise than usual, the image will look rough or grainy.

With a fully-charged battery, a single bulb exposure can be as long as about 2.5 hours.

By connecting Remote Switch RS-80N3 or Timer Remote Controller TC-80N3 ( optional) to the camera's remote control terminal, you need not keep pressing the shutter button with your finger during bulb exposures.



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