Camera can take pictures up to 4928 x 3264 resolution. It can also take pictures with lower resolutions like 4352 x 3264, 4224 x 2816, 4928 x 2776, 4224 x 2376, 3840 x 2880, 3456 x 2304, 3456x1944, 3264 x 3264, 3072 x 2304, 2880 x 2880, 2688 x 1792, 2688 x 1512, 2304 x 2304, 2304 x 1728, 1728 x 1728 with 1:1, 4:3, 3:2, 16:9 aspect ratios.
Lens Mount
Pentax K-01 has Pentax KAF2 lens mount. Due to APS-C sensor its crop factor (also called lens multiplier) is 1.5x. This means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length times 1.5.
In-Body Image Stabilization
The camera has a built-in Sensor Shift in-body image stabilization (IBIS). This means that you are still getting vibration reduction when camera is paired with non-image stabilizied lenses. It also works with lenses with optical image stabilization and in combination can achieve even better compensation.