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Thread: What is mirror lockup?

  1. #1

    Default What is mirror lockup?

    Anyone can teach me a little on what is mirror-lockup and how does it help in taking shots?

  2. #2

    Default Re: What is mirror lockup?

    MLU is when the mirror goes up,stays there for a brief moment, then the shutter opens. meant to reduce shake, esp when shutter speed between 1/10 to 1sec. ~abouts. probably shld use tripod with it.

    can google or dpreview for such queries in future as well.

    Cheers
    Last edited by di0nysus; 4th January 2006 at 11:01 PM.

  3. #3
    Senior Member +evenstar's Avatar
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    Default Re: What is mirror lockup?

    Quote Originally Posted by Sukoo
    Anyone can teach me a little on what is mirror-lockup and how does it help in taking shots?
    If you activate MLU, the mirror inside the camera will snap up when you press the shutter for the first time. When you press the shutter the 2nd time, the image is taken. This is to reduce camera shake caused by the mirror when it slaps up.

    Mirror shake occurs most distinctively at shutters from 1/15 - 1". When you use MLU, either use a cable release or set a 10-sec timer
    eat. drink. shoot

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    Default Re: What is mirror lockup?

    another function if you using dslr to clean ur CCD sensor

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    Default Re: What is mirror lockup?

    it's the place they send "bad" mirrors to!!

    http://www.luminous-landscape.com/tu...ror-lock.shtml

  6. #6

    Default Re: What is mirror lockup?

    mirror lockup can:
    1 when taking photos, reduce shake.
    2 for cleaning the low-pass filter in front of the image sensor.

  7. #7

    Default Re: What is mirror lockup?

    Quote Originally Posted by Sukoo
    Anyone can teach me a little on what is mirror-lockup and how does it help in taking shots?
    Read this and you'll have a good technical knowledge of what mirror-lockup is and how it can help in taking shots :

    http://www.photozone.de/3Technology/camtec2.htm

    These vibrations are wave-shaped, which means finally nothing else than periodical up- and downward movement of the camera. This movement can cause a certain blur effect which can result in a deterioration of image quality (see picture below). This problem is not relevant at all shutter speeds reciprocal to lens’s focal range (for example 1/200 for 200 mm lens) but it can and will have an effect between, lets say, 1/60s and 1/4s. So what can be done about it? First, modern SLR cameras offer improved mirror-dumping mechanisms. Second, many mid and upper class camera models provide a feature called "mirror lock-up" (MLU). The idea about MLU is that the mirror is activated long before the shutter mechanism is released. Therefore the mirror vibrations have time to be eliminated or at least damped to an uncritical level. There a two types MLUs:
    • "mirror pre-fire" - this is an automated version which is coupled to the camera timer. The camera activates the mirror and waits a few seconds before releasing the shutter.
    • "mirror lock-up" - the user can manually switch the mirror to its upward position and has to release the shutter. Usually MLU is only used with a camera mounted to a tripod. In this case tripping shutter with the conventional shutter release button is meaningless, because this operation would result in much heavier vibrations than any mirror could produce! Therefore, a remote shutter release is a necessity here!
    Using the MLU for handheld shots doesn’t make much sense as viewfinder blacks out – errors in composition are inevitable.
    Last edited by Clockunder; 5th January 2006 at 03:46 PM.

  8. #8

    Default Re: What is mirror lockup?

    Quote Originally Posted by Sukoo
    Anyone can teach me a little on what is mirror-lockup and how does it help in taking shots?
    Mirror lock up is mostly used when you are shooting high magnification shots like photomicrography or when using super telephoto lenses. Usuallly, when the mirror flips, it will induce vibration, so by locking the mirror in the up position, you can reduce the mechanical vibration due to the mirror.

    There are also some lenses which requires locking the mirror. Nikkor 6mm fisheye is one such example. This is due to the rear elements protruding further back than ordinary lenses and would crash into the mirror if it has not been locked up. Since the angle of view is a whopping 220 degrees, you don't need to aim through the lens nor is there a need to focus due to the extremely wide depth of field.

  9. #9
    Senior Member +evenstar's Avatar
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    Default Re: What is mirror lockup?

    Quote Originally Posted by lwt11137
    another function if you using dslr to clean ur CCD sensor
    Cleaning sensor can simply use the "Sensor Clean" function if you have one
    eat. drink. shoot

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