Why there is no third parties Teleconverters for FE mount?

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Thomas KP Lee
Thomas KP Lee Contributing Member • Posts: 510
Why there is no third parties Teleconverters for FE mount?
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The Sony FE mount 1.4x and 2X teleconverters has been out for more than two years by now, however, there is no third party producing FE mount teleconverters.  Why producers like, Kenko, Tamron, Sigma, Viltrox, etc does not make any FE teleconverter yet? As the Sony teleconverters are expensive, plus I would like to see third party teleconverter that do not have the protruted front.

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