GR IIIx - RING CAP GN-2 (the GR III uses RING CAP GN-1). GR IIIx - GV-3 External Viewfinder (the GR III uses the GV-1, GV-2). GR IIIx - GA-2 Lens Adapter (the GR III uses GA-1). High-Resolution GR Lens.
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