[miro]

60mm f/2.8
35mm f/2

https://www.sonyalpharumors.com/zenitar-...acro-lens/

I've to admit that I have a soft spot for Zenitars ;-)

What is public status of every mount?
As far as I know
L mount - open standard
4/3   - open stadart
FE - open standart
RF - ??? no idea
Z - ?? no idea
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Lets say I'm Sigma, Tamron , Tokina, Chinese startup or Russian optics manufacturer. Do I have access to current RF/ or Z specs? Am I equal member in such aliance? Can I influence future development of the standard?

You forgot Fuji-X mount. I think they opened it up recently to some manufacturers at least (Tokina, Viltrox), but I'm not sure whether it's publicly open.

Thanks for addition.