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Jonas B, changed the Live View Display to off on the menu and the screen still gets dark at f/22.
Mine does this too, but only in dark conditions. It probably has something to do with the camera meters and uses live view in dark conditions.
Either way, to be honest, I've never even shot the camera with an aperture smaller than f11. Diffraction already sets in by f11, so, at f22, you're really robbing yourself of resolution.