Exposure Lock (AE-L Button) is the abbreviation stands for Automatic Exposure Lock. It is useful using automatic and semi-automatic shooting modes. Where has this information been all my photographing life? So freaking helpful it's not even funny.
Engineers Develop Programmable Nanophotonic Processors This futuristic drawing shows programmable nanophotonic processors integrated on a printed circuit board and carrying out deep learning computing. RedCube Inc., and courtesy of the researchers