The Pentax K-3 Mark Iii builds on the Pentax legacy of outstanding image quality, incorporating a back-illuminated Cmos image sensor with approximately 25.73 effective megapixels. By coupling this sensor with an Aa (anti-aliasing)-filter-free optical design, the camera produces super-high-resolution images.a new, super-bright optical viewfinder delivers a nearly 100% field of view and magnification of approximately 1.05 times. With a newly developed high-refraction glass prism, the viewfinder provides a wide field of view equivalent to that of a full-frame Slr, fully immersing the photographer in shooting. It features a high-performance, five-axis shake-reduction (Sr) system and the innovative Pixel Shift Resolution System.