Is Sigma Introducing an Impossible Lens?

Third party lens manufacturing has improved immensely over the years. While people were relying on brands such as Zeiss to provide good options, Japanese manufacturers have pushed the envelope a bit more. One such example is Sigma, who has introduced cost-effective alternatives to Canon, Sony, and Nikon users. It now appears, the company may have some plans up their sleeves for a unique lens. Have a look.