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| Authored by: nsomos on Monday, May 21 2012 @ 01:36 PM EDT |
The old single-lens reflex cameras had a mirror which had
two positions. The one position redirected light from
the lens up to the viewfinder optics, and the other position
had the mirror out of the way, permitting light to reach
the film at the focal plane. When a photo was taken, the
mirror first had to quickly move out of the light path,
and then a focal plane shutter that was in front of the
film would open, pause, and then close. All these operations
(but for the pause) were in tiny fractions of a second.
(The pause was adjustable from real tiny fractions, to
'must be using a tripod to avoid blurs' speeds)
After the shutter closed again, the mirror would once more
move into the light path to allow the viewfinder to work.
The sound and/or vibration the mirror made when moving
out of the way, could be referred to as a 'mirror slap'.
According to camerapedia ...
"Mirror Slap is a form of camera shake due to the vibration caused
by the mirror in an SLR flipping out of the way before a shot."
http://camerapedia.wikia.com/wiki/Mirror_slap[ Reply to This | Parent | # ]
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