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Frequently-asked questions about Four Thirds can be found here. Please read this page before making an inquiry.  FAQ


For details on each manufacturer’s products, please visit the website of the manufacturer in question.

Olympus products
Panasonic products
Sigma products
COSINA products

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.

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