ID28

Improved picture quality through mirror lock-up in SLR cameras

High-quality SLR cameras allow you to flip the mirror up before exposure. Disruptive vibrations caused by the mirror reverberating no longer occur in the sensitive exposure period. Any type of vibration or motion during the exposure of the sensor chip or film reduces the picture quality.


Vibration measurements during image recording with a Canon EOS 350D

• 1. Mirror lock-up flips up mirror
• 2. Sensor exposure begins: The focal-plane shutter is opened
• 3. Exposure is complete. The focal-plane shutter and the mirror return to their original position.
  

The image recording sensor is exposed during phases 2 and 3. No motion or vibrations should occur during this period. Any disruption in this stage considerably reduces the picture quality, particularly in the case of pictures in microscopy, macroscopy or astronomy, where the smallest detailed areas must be in focus. A camera with mirror lock-up should definitely be used in these cases.





Camera perspective for a Canon EOS 350 Digital with removed lens:

The mirror is in its original position, flipped down. In this stage, the object can be observed using the viewfinder. The recording sensor or film is protected from the light by the closed focal-plane shutter.





In the stage between phases 1 and 2, the mirror is flipped up. It is no longer possible to see the object through the viewfinder. The sensor is only protected from the ambient light by the focal-plane shutter.




The exposure takes place when the focal-plane shutter is opened in the period between phases 2 and 3. If the lens is removed, it is now possible to look directly at the recording sensor.





At the end of the exposure, the focal-plane shutter closes. The camera mirror is flipped back to its original position. The camera is now ready to take the next picture.







For the best picture quality we recommend using a remote-control release or using a computer to control the digital SLR camera. This is a sure way to avoid pictures being blurred or fuzzy due to camera shakes.

Canon EOS 1D X / Canon EOS 1D Mark IV / Canon EOS 60D / Canon EOS 600D / Canon EOS 5D Mark II / Canon EOS 7D / Canon EOS 550D / Rebel T2i / Kiss X4 Digital / Canon EOS 1100D / Canon EOS 1D Mark III / Canon EOS 1Ds Mark III / Canon EOS 500D / Digital Rebel T1i / Canon EOS 50D / Canon EOS 450D / Digital Rebel XSi / Canon EOS 1000D / Canon EOS 1D Mark II / Canon EOS 5D / Canon IXUS 1000 HS / Canon IXUS 310 HS / Canon PowerShot S80 / Canon PowerShot A3300 IS / Canon EOS 40D / Canon EOS 1Ds Mark II / Canon PowerShot G12 / Canon IXUS 300 HS / Canon PowerShot G10 / Canon HR10 / Canon IXUS 980 IS / Canon PowerShot SX210 IS / Canon IXUS 130 / Canon IXUS 210 / Canon PowerShot A2200 / Canon PowerShot G9 / Canon IXUS 960 IS / Canon IXUS 100 IS / Canon IXUS 110 IS / Canon PowerShot A1100 IS / Canon IXUS 990 IS / Canon PowerShot A2100 IS / Canon PowerShot D10 / Canon PowerShot SX200 IS / Canon PowerShot SX20 IS /

 

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