Canon 0304B001 User Manual - Page 111
Mirror Lockup
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Mirror Lockup Mirror lockup is enabled with C.Fn-12. (p.165) 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 3 . 1 Press the shutter button completely. X The mirror will lock in the up position. 2 Again press the shutter button completely. X The picture is taken and the mirror goes back down. In very bright light such as at the beach or ski area 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. Bulb exposures cannot be used with the self-timer. During the self-timer countdown, if you let go of the shutter button, there will be a shutterrelease sound. This is not the shutter release (no picture is taken). During mirror lockup, the drive mode will be single shooting (u) to override the current drive mode (single or continuous). 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 mirror lockup shots, using Remote Switch RS-80N3 or Timer Remote Controller TC-80N3 (both optional) is recommended. Eyepiece Shutter If you take a picture without looking through the viewfinder, stray light may enter the eyepiece and affect the exposure. To prevent this, turn the eyepiece shutter lever as shown by the arrow to shutter the eyepiece. 111
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