After picking up a Zeiss Ikon Tessar, I was curiously surprised to realize that the little beauty isn't equipped with a rangefinder. I was so enamored with the compactness of the folder that I never noticed the viewfinder difference about the class. So, while playing with it yesterday, I was torn between using the flip up "sportsfinder" or the prism on the shutter housing. For no particular reason, I've always been distrustfull of the sportsfinders on my Crown Graphic and my tlrs. I therefore struggled with the tiny ("tiny" is being generous) little prism finder. Let's just say that it made framing and composition, wel, err...interesting... Do any tlr or folder veterans have any experience and/or advise in the use of the, obviously easier to use, sportsfinder? Do you match up the front frame edge with the back? Is the finder relatively accurate?