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The properties control the camera focus, it the camera supports it.
TRVCamFocus = (rvcfFocusAuto, rvcfFocusNear, rvcfFocusFar); // defined in MRVType unit
property FocusType: TRVCamFocus;
property FocusDistance: Integer;
FocusDistance is used only if FocusType<>rvcfFocusAuto. Possible values:
If the camera supports these properties, their values are received from the camera when the component is connected to it, see SearchCamera.