Never having used one before I am thinking that my vision of a scene through an optical viewfinder like what is available for the GRII offers me the same vision clarity and focus as my normal eyeglass vision does (which at times is not too great). When I use the Oly E-1 I have adjustable diopter correction available to help sharpen the focus. Is this a correct understanding? How do eyeglass users compensate for sharper focus when using the optical viewfinder?