The GR IV HDF incorporates the RICOH-original HDF (Highlight Diffusion Filter), which is designed to emphasize highlights and produce mellow, soft images. Developed by taking advantage of the advanced inkjet technology RICOH has cultivated over the years, this special-effect filter diffuses highlight areas and creates a blurred effect along the image’s edges, making it possible to capture nostalgic images resembling those captured in film photography or movies. Since the HDF can be instantly switched on and off with a single action, it lets the user alternate between two completely different visual expressions — clear, sharply focused images representative of the RICOH GR series, and mellow, soft images captured by the HDF — depending on the subject or creative intention.

In addition to a conventional mechanical shutter unit, the GR IV HDF also features an electronically controlled shutter mechanism*, which allows the user to intentionally raise the shutter speed up to 1/16,000 second, making it possible to capture images at extremely bright locations while still setting a larger aperture.

• Single-action switching to the built-in HDF, to create mellow, soft images          
• High-speed electronic shutter with a top speed of 1/16,000 second for shooting at extremely bright locations                                                                                
• The color of the shutter-release button has been changed from the GR IV’s black to grayish silver, to symbolize the camera’s ability to instantly shift the image’s visual expression. The default setting of the Fn (Function) button is set to the on/off action of the HDF. 

Note: All other functions of the RICOH GR IV HDF are identical to those of the RICOH GR IV, except for the availability of the ND (Neutral Density) filter.