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.