Developed as a camera that defines the PENTAX PRINCIPLES, the PENTAX K-3 Mark III Body features a host of functions and outstanding imaging performance to optimize the fun and excitement of the entire photo-shooting process — for photographers who are particular about the key values of SLR cameras, and who cherish photography as a lifetime passion. PENTAX developed a top-grade, easy-to-view optical viewfinder which fully immerses the photographer in shooting. It also renewed key devices, including the image sensor, imaging engine and accelerator unit. This was done to provide the highest possible image quality, and attain the super-high top sensitivity of ISO 1600000. The compact, sturdy camera body assures excellent operability and portability — benefits characteristic of the APS-C format.