Sigma has announced the BF, a new 24.6-megapixel full-frame, mirrorless camera that has a built-in SSD rather than an a CFexpress or SD card slot. The company is known for making lenses and unconventional cameras, and the BF's design and unique approach to storage definitely fit the bill.<br /> The Sigma BF is milled from a single block of aluminum, and looks it, with mostly flat, angul [...]