Very long chose. I already stopped at Olmpus 25 mm f 1.7, but somehow suddenly a sigma with aperture ratio of 1.4 suddenly appeared on sale. Pros: Aperture-fast. Cutting. A juicy picture that is noticeably different from the whale Olympus. The body is made of metal and rubberized with pleasant materials Different cons: Video is not the strong point of this lens. Although there is autofocus in the carcass in the lens itself, this does not help. Long focus