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Simple question really. Why do these cameras use micro four thirds?

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    \$\begingroup\$ Have you checked the web sites of Panasonic and read the Wikipedia entry for Micro Four Thirds? What specific kind of reason do you need for Panasonic using a standard they have agreed on with several other manufacturers? \$\endgroup\$
    – user86810
    Sep 8, 2019 at 20:10
  • \$\begingroup\$ I want to learn reasons they use Micro Four. Why and history why and how. \$\endgroup\$ Sep 8, 2019 at 20:10
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    \$\begingroup\$ The same reason Olympus uses micro four thirds :-) \$\endgroup\$
    – Eric S
    Sep 9, 2019 at 1:15
  • \$\begingroup\$ @EricShain Not necessarily. One of them might use the standard mostly because the other does, rather than for the reasons the other chose it. \$\endgroup\$
    – Michael C
    Sep 9, 2019 at 4:33
  • \$\begingroup\$ @MichaelC They developed the standard together. \$\endgroup\$
    – Eric S
    Sep 9, 2019 at 12:37

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About Four Thirds system:

Before wide screen (16:9) monitors and televisions were popular, 4:3 monitors/televisions as the norm; so I guess it seems normal to have sensors which are compatible.

The Micro Four Thirds system has a shorter registration distance (a/k/a flange focal distance), to reduce the weight (and price) for cameras, but uses the same sensor size and 4:3 aspect ratio.

Wikipedia:

Wikipedia: Four Thirds system

Wikipedia: Micro Four Thirds system

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    \$\begingroup\$ 4/3 refers to the sensor size, as well as the aspect ratio. Micro 4/3 is the same size sensor, it is smaller because it is mirrorless. \$\endgroup\$
    – vclaw
    Sep 8, 2019 at 22:10
  • \$\begingroup\$ @vclaw It would probably be more precise to say, "Micro 4/3 is the same size sensor. The registration distance (flange focal distance) being shorter requires it to be mirrorless." In other words, Micro Four-Thirds is mirrorless because the shorter FFD does not leave room for a mirror, not the other way around. One could have a mirrorless system with a FFD long enough to allow a mirror, but one can not have an SLR with a FFD too short for a mirror. \$\endgroup\$
    – Michael C
    Sep 9, 2019 at 4:35
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    \$\begingroup\$ Four Thirds is not really compatible or interchangeable with Micro Four Thirds. Micro Four Thirds is mirrorless, Four Thirds is DSLR. Micro Four Thirds lenses can NOT be used on a Four-Thirds camera body. Four Thirds lenses can be used on a Micro Four Thirds camera body if you use an adapter. \$\endgroup\$ Sep 9, 2019 at 14:04
  • \$\begingroup\$ @MikeSowsun True ... I meant with compatible the output ratio is compatible (meaning that no conversion is needed from 16:9 to 4:3 of otherwise when using either normal four thirds or micro four thirds). \$\endgroup\$ Sep 9, 2019 at 14:13

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