GA-3 Lens Adapter

Ricoh GA-3 Lens Adapter — Unlock Filters and Ultra-Wide Shooting on Your GR IV

The gist: The only official way to attach 49mm screw-in filters or the GW-4 Wide Conversion Lens to the Ricoh GR IV — a required accessory for GR IV owners who want any optical control over their images beyond the built-in lens.

• Opens up the 49mm filter ecosystem: Once the GA-3 is attached, the GR IV accepts any standard 49mm filter — circular polarizers to cut water glare, ND filters for long exposures, or UV protective glass for coastal and dusty environments.
• Required for the GW-4 Wide Conversion Lens: The GW-4 converts the GR IV’s 28mm equivalent focal length to 21mm — essential when photographing interiors, narrow alleyways, or tight cityscapes where you can’t step back far enough.
• Dedicated fit for the GR IV body: Designed specifically for the GR IV — not a generic third-party adapter — so it mounts securely without play or light leaks around the lens barrel.
• Compact, no added bulk: Slips on without fundamentally changing the GR IV’s form factor — it remains pocketable with the adapter attached and no filter installed.

B&H Photo confirms the GA-3 is the designated adapter for attaching the GW-4 Wide Conversion Lens or any 49mm filter to the Ricoh GR IV, making it a mandatory purchase for photographers who want to expand the GR IV’s optical versatility.

Best for: Ricoh GR IV owners who want to add filters for landscape or street photography, or who need the ultra-wide 21mm GW-4 perspective for architectural or interior work. Skip it if: You don’t own a GR IV — this adapter has no compatibility with other camera bodies. Runs ~$50 — check the current price before buying.