At the heart of the GFX 100S platform is the 102MP 44 x 33mm BSI CMOS sensor, which offers the ultra-high resolution coveted by stills photographers as well impressive 4K video recording options, too. The sensor pairs with the X-Processor 4 in order to output 16-bit raw imagery with a broad dynamic range, low noise levels, and sensitivity to an ISO 12800, and the BSI design of the sensor contributes to high clarity and accurate color rendering when working in a variety of lighting conditions. In terms of video, DCI and UHD 4K video recording is possible at 4:2:0 10-bit internally, 4:2:2 10-bit via HDMI, or raw 12-bit if recording externally, and an F-log gamma setting can also be used for more advanced color grading during post-production. Beyond high-resolution shooting, the unique sensor design also incorporates a sophisticated hybrid AF system that features 425 selectable phase-detection points, which cover nearly the entire frame, and aid with precise face and eye-detection modes.