Sigma SA Mount

Started 2 months ago | Discussions thread
danski0224 Senior Member • Posts: 1,215
Re: Sigma SA Mount

Lynxo wrote:


Can you fill me in? When Sigma made their own camera bodies, was it a legal issue they did not choose to use existing mounts such as Canon and Nikon?

I would have two guesses:

The EF mount (Canon) would have been new at the time, and most certainly patented. The other is that the companies in question are all Japanese, and as I understand it, the companies will not blatantly copy/steal from each other.*

*: While Sigma did not steal the Canon EF mount in carbon copy form, Sigma chose to use the same flange distance as Canon so the Sigma lenses would optically work on the camera body with the biggest market share, and the electrical pinouts are the same, but in a different place.

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