Incorporating a newly developed highlight diffusion filter (HDF), the Ricoh GR IIIx HDF allows users greater control over the style of their imagery while maintaining exceptional image quality. Captures with HDF enabled are noticeably softer and feature an emphasize on highlights, resulting in a more nostalgic look that resembles film photography or vintage movies. The default setting of the Fn button is now set to turn HDF on or off. This model also features a dark silver shutter-release button to distinguish itself from previous GR series models. Lastly, new firmware allows Zone Select AF as well as up to three white-balance settings to be preprogrammed as the base white balance.