Special design for HDF (Highlight Diffusion Filter) models only The existing GR III and GR IIIx are newly equipped with the HDF (Highlight Diffusion Filter), which enhances light and produces a softer depiction, enabling emotional expression similar to that of film photography and movies. HDF (Highlight Diffusion Filter) ON/OFF Comparison By diffusing incoming light, the filter reduces overall image contrast and blurs whites in bright areas, giving the image a soft, fluffy appearance. Up to 3 custom white balances can now be registered. The base white balance and your own fine-tuned white balance can be assigned in combination. The new firmware includes “Zone-select AF,” which allows the user to select any zone within the 3×3 focusing area* and automatically focus on the appropriate position within the area. The release button is painted a grayish silver color. The appearance changes depending on the angle of light. HDF ON/OFF switching function is assigned to Fn button by default.