How to use lens filters on RICOH GR series

A separate adapter is required to use lens filters with the RICOH GR series.
The adapters that can be used vary depending on the GR series version. Please see below.

GR III

Genuine RICOH Lens Adapter [GA-1]
https://ricohimagingstore.com/lensadapter-ga-1-s0037817.html
It allows the attachment of the 0.75x wide conversion lens GW-4 and a φ49mm filter.

GRⅢx

RICOH genuine Lens adapter [GA-2]
https://ricohimagingstore.com/lensadapter-ga-2-s0037826.html
It is possible to attach the teleconversion lens GT-2, which allows shooting at a focal length equivalent to 75mm (35mm format), or a φ49mm filter.

GR II

RICOH genuine Hood & Adapter [GH-3]
https://www.ricoh-imaging.co.jp/japan/dc/option/lens/
This set includes a hood and an adapter for attaching a φ49mm general-purpose filter, etc.

GR DIGITAL III / DIGITAL IV

RICOH genuine Hood & Adapter [GH-2]
https://www.ricoh-imaging.co.jp/japan/dc/option/lens/
This set includes a hood and an adapter for attaching a φ43mm general-purpose filter, etc.

GR DIGITAL II / GR DIGITAL

RICOH genuine Hood & Adapter [GH-1]
https://www.ricoh-imaging.co.jp/japan/dc/option/lens/
This set includes a hood and an adapter for attaching a φ37mm general-purpose filter, etc.

For more information, please visit the RICOH website.