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Who licensed A-Mount?

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Steve-S View Drop Down
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    Posted: 18 July 2021 at 00:15

I know Tamron/Minolta had a special relationship, and I'm pretty sure it included use of authorized A-Mount protocols under license from Minolta (and later Sony)
... but maybe I'm wrong?

I think Sigma mostly reverse-engineered the protocols for their 3rd-party lens offerings (Sigma lenses on CaNikon bodies, too)
... but maybe I'm wrong?

Who else is known to use either "licensed" or "reverse-engineered" protocols for A-mount?

TYVM!
Alpha: a77+7000; SAL 18135, SAL1870, MinO50/1.7, Tam200-500, Tam90/2.8, Smyg85/1.4, others.
SR(MC/MD): XD-11, XK+AEhead Min50/1.7&1.4, Tam70-150/3.5, Viv35/2.8, Viv2xTC
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 18 July 2021 at 04:04
I have a sales page for the Tokina AF-352 that states, "Licensed By Minolta"

I believe the others are Tamron, Cosina, and Kobori. Possibly Angenieux.

"Samyang claims to use a logic circuit that does not violate Minolta patents on AF lens systems." Pop Photo Jan-March 1988 p.77

Edited by QuietOC - 18 July 2021 at 12:07
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Steve-S View Drop Down
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Post Options Post Options   Quote Steve-S Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2021 at 09:27
Thank you!
Alpha: a77+7000; SAL 18135, SAL1870, MinO50/1.7, Tam200-500, Tam90/2.8, Smyg85/1.4, others.
SR(MC/MD): XD-11, XK+AEhead Min50/1.7&1.4, Tam70-150/3.5, Viv35/2.8, Viv2xTC
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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2021 at 10:25
Originally posted by Steve-S Steve-S wrote:


I think Sigma mostly reverse-engineered the protocols for their 3rd-party lens offerings (Sigma lenses on CaNikon bodies, too)
... but maybe I'm wrong?


I thought this as well, but many years ago I had a Quantaray 28-200 zoom, which I think was a rebadged Sigma - it had a Licenced by Minolta engraving, which suggests Sigma might have had some form of licence at some point.
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