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Sigma Lens Compatibility Issues
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<blockquote data-quote="hark" data-source="post: 679859" data-attributes="member: 13196"><p>I don't know about the patent. What I can say is I have 3 Sigma lenses that were made in the late 1990's...so they are around 19-20 years old. And they are the Nikon AF-D mounts--according to what I read about the AF-D mount, they were initially released in 1996. So if there was a patent on the mount, then maybe Sigma didn't pay to use it back then and might not be paying to use the current mount now? I don't know....</p></blockquote><p></p>
[QUOTE="hark, post: 679859, member: 13196"] I don't know about the patent. What I can say is I have 3 Sigma lenses that were made in the late 1990's...so they are around 19-20 years old. And they are the Nikon AF-D mounts--according to what I read about the AF-D mount, they were initially released in 1996. So if there was a patent on the mount, then maybe Sigma didn't pay to use it back then and might not be paying to use the current mount now? I don't know.... [/QUOTE]
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