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Forum: Pentax SLR Lens Discussion 05-14-2016, 12:11 AM  
K1, K-mount and Samyang autofocus lenses
Posted By osv
Replies: 10
Views: 2,400
this was just argued on dpr, see below.

as for the availability of ff k-mount glass, there is a metric ****load of it out there, no shortage whatsoever, if you are limiting yourself to only the very latest af lenses you are putting yourself at a rather large disadvantage.

"First: Only "qualified" corporate entities can even start the process of requesting the specs. - "Disclosure is made only to legal entities which satisfy the qualification criteria predefined by Sony, as a licensee of the Basic Specifications. Application from individuals will be declined."

Academic research institution like University of Kentucky (dpreview user ProfHankD) - Nope.

Small (self-employed) company like Phigment Technologies ( https://www.phigmenttech.ca/lmnex/index.php?page=product ) - Nope.

Most well-known adapter manufacturer in the industry (Metabones) - Nope. MetabonesŪ - "We are not licensed, approved or endorsed by Blackmagic Design, Canon, JVC, Micro Four Thirds, Olympus, Panasonic or Sony. Our Smart Adapter and Speed Booster were developed independently without any involvement by the aforementioned companies."

In addition, they are stated to be "basic" specifications. We don't know the exact definition of "basic" but the fact that Metabones has not received protocol assistance from Sony indicates that it isn't even enough to make an adapter that emulates an LA-EA3, let alone a full-blown native lens (much more complex protocol). Most likely it's mechanical specifications only, enough for dumb adapters but not enough for autofocus."
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