20.1 MP APS-C CMOS Sensor. This high-resolution sensor provides great image quality within its normal ISO range of 100-51,200. Like the Pentax K-3, the K-S2 features a user-selectable anti-aliasing filter. The PRIME M II Image Processing Engine allows 5.5 FPS continuous shooting.
Autofocus System. The SAFOX X autofocus system uses eleven phase-detection points (nine cross-type) with a sensitivity range of -3 to 18 EV.
Sensor-Shift Image Stabilization. The in-camera image stabilization offers up to three stops of rotational correction to help eliminate camera shake. This system is also used to remove dust and enable AA-filter simulation.
Video. The K-S2 shoots Full HD 1920x1080p at up to 30 FPS, saving videos as MOV files. A built-in stereo mic records audio embedded in the video file. There's also an in-camera time-lapse mode that captures up to 4K.
Built-in Wi-Fi. This is the first Pentax DSLR to feature built-in Wi-Fi. Like most other manufacturers' cameras, it allows remote operation and image transfer.
High-Quality Build. Despite its consumer-level focus, the K-S2 still features a weather-resistant build in a compact body. There's an optical viewfinder with 100% coverage and 0.95x magnification, and a 3.0" 921k-dot vari-angle LCD monitor for live-view shooting and image review. Images are recorded to SDHC/XC memory cards, and the included rechargeable battery is rated for roughly 410 shots per charge.