Viewfinders: Leica vs Panasonic vs Voigtlander vs Ricoh – Extensive discussion on the use of various external viewfinders with the Panasonic DMC-LX3.
The Voigtlander 25mm optical viewfinder stands out in particular as highly recommended.
The LCD can be turned off if you plan to use an OVF (optical viewfinder), and the green focus confirmation will continue to be displayed.