Mirror lock-up

As a mirror lock-up (short- SVA, English:. MLU for mirror lock-up, also MUP Mirror up ) refers to the ability to clear flip up the oscillating mirror of an SLR in time before the actual recording. This blur is reduced by natural vibrations of the camera. Frequent application are eg night shots.

  • 2.1 Old Super Wide Angle
  • 2.2 Live Preview
  • 2.3 Sensor Cleaning

Use

Basically, the mirror lockup is used with a tripod or other. be used. It is used to reduce vibration, especially at shutter speeds ranging from 1 /30 to 1/2 second.

When shutter is released, the mirror is swung out of the beam path. The jerky swing shakes the camera, which can affect the sharpness of the image caused by hand shake. This effect occurs especially when using lenses with long focal lengths and / or long exposure times, which is above the free-hand limit ( 1/60 s at normal focal length ) from which a tripod should be used, and below the shutter speeds of long exposures (1 second or longer ) lie.

For shorter exposure times of the closure is already too again before the blur on the image effect; predominates at longer exposure times, the time in which the camera back has been attenuated, and is at rest. Nevertheless, the mirror lock-up should also be used in outstanding long -term exposures.

By early the mirror moves, the camera and the mount (tripod, etc.) time to stabilize again. Noticeable effect of this in practice is only when using a tripod, otherwise can lead to quite different causes camera shake or to blur.

Specifically, the mirror lock-up is used at night and astrophotography because of camera shake emerges particularly strong due to the dark background.

In order to test the performance of lenses and cameras under laboratory conditions, the mirror lock-up is always used.

Handling

In the mirror lock-up, there are various methods that differ in the handling.

  • In older camera models, the mirror is flipped up manually using a separate lever and remains after triggering usually in this position, so it must be reset manually again (eg Nikon F, Minolta SR- T 101). Advantage of this variant is the unconditional locking the mirror in a folded position, which, for example, the use of lenses that protrude into the mirror box needed.
  • A further development is a mirror lock-up, in which is raised by pressing a pre-trigger lever of the mirror by the energy used for the normal oscillation process, but no shutter release takes place, and this occurs only when the normal triggers. (eg Kiev 88 ).
  • Modern cameras slow down the shutter release automatically to a partially adjustable time and automatically fold the mirror after taking back (eg Nikon D100).
  • Other cameras in the fold mirror lock -solving mode ( MUP, Mirror up) the mirror in the first printing high on the trigger. With a second press of the shutter, the actual picture is taken, after which the mirror will automatically turn back into the beam path back. For power saving reasons, the mirror flips back after a certain time, even if no recording is done (eg Nikon D200 ).

Spiegelarretierung for other purposes

The function is sometimes referred to as mirror lockup or Spiegelarretierung. These terms, however, are misleading, because they do not serve the immediate release operation, but technical or maintenance purposes.

Old super wide angle

Originally, however, the purpose of this device was different. Certain lenses, especially older wide angle lens and fisheye designs exhibited far superior in the camera body lens groups which would interfere with the oscillating mirror. These lenses could therefore be used only with cameras that were equipped with the mirror lock-up. With this you can then again speak of a Spiegelarretierung since, even after the initiation of the mirror was not allowed to snap back to its original position to prevent its damage through the lens.

Live Preview

See main article LiveView

The Olympus E-330 was the first DSLR to fold up the possibility of the mirror, for example, to increase 10 -fold at a macro shot over a live monitor and determine exactly sharp.

Sensor Cleaning

The sensor cleaning on DSLR camera models is a common occasion when the mirror has to be folded up and kept in this position. There are at most DSLR a certain point in the menu, but which must not be confused with the classic mirror lockup. Recordings are in this position not possible.

Optical path Minolta SR-T 101
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