Optics manufacturer NiSi has announced a new square filter holder for Ricoh GR III camera systems.
The filters, which are constructed of an aluminum alloy, fit on the end of the extending lens packed inside the GR III and can rotate a full 360-degrees. While a clever solution to adding photo filters to a point-and-shoot camera, this also means the filter holder will pop off when the camera is powered off and the lens retracts, so make sure to remove the filter holder when turning off the camera (and make sure the auto-off functionality is turned off).
As for the filters themselves, NiSi is offering two kits: the Starter Kit and the Professional Kit. The Starter Kit includes a graduated neutral density filter (GND8) and polarizer; the Professional Kit includes those two filters as well as an IR neutral density filter (ND8) and a natural night filter. Both kits include the holder and a cloth carrying pouch for safe transport.