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Sigma Lens Compatibility Issues
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<blockquote data-quote="Texas" data-source="post: 679849" data-attributes="member: 42267"><p>20 years go by and they expire, I think it used to be less than that. The Nikon F mount is a bit older than 20 years.</p><p></p><p>As an aside, I had 4 patents that expired in the early 90's and dozens of very slightly different patents were issued almost immediately by folks/companies that do this sort of thing.</p></blockquote><p></p>
[QUOTE="Texas, post: 679849, member: 42267"] 20 years go by and they expire, I think it used to be less than that. The Nikon F mount is a bit older than 20 years. As an aside, I had 4 patents that expired in the early 90's and dozens of very slightly different patents were issued almost immediately by folks/companies that do this sort of thing. [/QUOTE]
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