GW-4 Wide Conversion Lens

Ricoh GW-4 Wide Conversion Lens — Turn Your GR III Into a 21mm Travel Ultra-Wide

The gist: For Ricoh GR III owners who want one more focal length without a second camera body, the GW-4 extends the camera’s native 28mm to 21mm — gaining a meaningfully wider perspective for landscapes, architecture, and crowded interiors.

• 0.75× conversion to 21mm: Opens up expansive compositional room for city skylines, narrow alleys, and cathedral interiors that a 28mm frame simply can’t fit.
• Corner-to-corner sharpness: Reviewers at PhotographyReal.com confirmed “excellent corner to corner sharpness” with no visible image quality degradation compared to the bare GR III — the glass doesn’t compromise what makes the GR III special.
• All-metal build with hood included: Ships with lens caps, a petal-shaped lens hood (reduces flare at wide angles), and a case — practical inclusions for field use.
• GR III IBIS auto-adjusts: Metal contacts on the lens adapter signal the camera to recalibrate its in-body image stabilization for the wider focal length automatically.

Ricoh’s official US product page lists the GW-4 at $249.95 and notes it works exclusively with the GR III — not with the GR IIIx.

Best for: Ricoh GR III owners who regularly shoot architecture, street photography, or travel landscapes and want genuine 21mm coverage without a lens change. Skip it if: You own the GR IIIx (incompatible), shoot mostly portraits or telephoto subjects, or want to keep the GR III’s pocket-friendly profile — the GW-4 and its required GA-1 adapter add noticeable front weight. Runs $249.95 — check the current price before buying.