How to use mirror lockup on the EOS 20D and EOS 5D and EOS 30D.

Article ID: ART160532 | Date published: 06/09/2015 | Date last updated: 11/04/2015


How to use mirror lockup on the EOS 20D and EOS 5D and EOS 30D.


Mirror lockup is enabled with C.Fn-12 [Mirror lockup] set to [1: Enable]. The mirror can be swung up separately from when the exposure is made. This prevents mirror vibrations which may blur the image during close-ups or when a super telephoto lens is used. Set Custom Functions with [ Custom Functions (C.Fn)].

1. Press the shutter button completely.
  • The mirror will lock in the up position.
- 2. Again press the shutter completely.
  • The picture is taken and the mirror goes back down.
  • In very bright light such as at the beach or ski ground on a sunny day, take the picture promptly after mirror lockup.
  • During mirror lockup, do not point the camera lens at the sun. The sun' s heat can scorch and damage the shutter curtains.
  • If you use bulb exposures, the self-timer, and mirror lockup in combination, keep pressing the shutter button completely (2 sec. selftimer + bulb exposure time). During the self-timer countdown, if you let go of the shutter button, there will be a shutter-release sound. This is not the shutter release (no picture is taken).
  • During mirror lockup, the drive mode will be single shooting regardless of the current drive mode (single or continuous).
  • If you use the self-timer and mirror lockup, the shot will be taken 2 sec. after the mirror goes up when you press the shutter button completely.
  • The mirror locks up, and after 30 seconds, it will go back down automatically. Pressing the shutter button completely again locks up the mirror again.
  • For bulb exposures, using Remote Switch RS-80N3 or Timer Remote Controller TC-80N3 ( optional) is recommended.



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