Originally posted by SSGGeezer This is both good and bad news. Bad that there are multiple patents so it sounds as if the design is not even finalized, but good because it means that the lens is going to be produced. My bad point could be another good point and they are just patenting multiple designs that could be used in other focal lengths in the future, and by doing that, p they are protecting their intellectual property. Or just screwing with Sigma so they don't know which lens design to copy when they come crawling back to Making Pentax lenses after the D-FA 50 destroys their Art Lens business.
Multiple patents? You mean multiple designs in the single patent?
This is pretty standard practice in patents. Others were like that too.
Believe me, it's finalized.