How to use lens filters on RICOH GR series

A separate adapter is required to use a lens filter with the RICOH GR series.
Please refer to the following as the adapters that can be used differ depending on the version of the GR series.

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GRⅢ

RICOH genuine lens adapter [GA-1]
https://ricohimagingstore.com/lensadapter-ga-1-s0037817.html
Wide conversion lens GW-4 with 0.75x magnification and φ49mm filter can be attached.

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GRⅢx

RICOH genuine Lens adapter [GA-2]
https://ricohimagingstore.com/lensadapter-ga-2-s0037826.html
Tele-conversion lens GT-2 and φ49mm filter can be attached, which enables shooting at 75mm equivalent (35mm format equivalent).

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GRⅡ

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

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GR DIGITAL III / DIGITAL IV

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

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GR DIGITAL II / GR DIGITAL

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

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For details, see the RICOH website.