On 6/14/2016 2:28 PM, Igor PDML-StR wrote:
I remember hearing the legend that in era of film SLRs, Sigma did not purchase the information on the K-mounts AF interface from Pentax and was reverse-engineering it for the purpose of their (Sigma's) K-mount lenses. I don't know if that was fully correct or an urban legend. I am guessing you, Alex, might be referring to that here.
Sigma wouldn't have needed to buy anything. When Pentax made the K-Mount they didn't put a patent on it, possibly because they had been burned rather badly years earlier when they had patents on the instant return mirror overturned "for the good of the Japanese camera industry" and didn't want to go through it all over again.
-- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
