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I want to get more knowledge of M43 standard, and I assumed that as a standard it should be available with all specifications for the public — or at least for purchase — but couldn't get one. The official website http://www.four-thirds.org/en/microft/ gives only a high-level overview. I want to understand the communication protocol.

Where one can get standard documentation? Is it public?

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No. Micro Four Thirds is not an open standard. The specification is available to member companies, which are listed here. It's not a tiny list, but it's not large, either.

Your best bet is found on the contact page, which says (sic):

To Manufacturers considering developing or selling the Four Thirds compliance product.

For inquiries on Four Thirds System standard, please contact the following E-mail address. four-thirds@ot.olympus.co.jp

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