Just got my first Leica, an M3 with collapsible 5cm Summican f/2. With the lens pulled out and turned to lock in place, I focus on an object about 4-5 feet the focusing scale shows maybe 1 to 1.5 feet. I also got a Nikkor 10.5 cm that seems to focus fine. I've used rangefinders before (Canon GIII QL17) so I'm used to the basic idea of focusing with a rangefinder. So is there some secret adjustment or setting that's not obvious or is there likely something that needs to be fixed on the camera or lens?