Trying to figure out what I've overlooked. I have a Meike 60mm manual macro lens attached to my XS10. I have "shoot without lens" turned on and focus set to MF, camera in manual mode. When I go to the MF Assist menu, I can select any of the options (eg. Standard, Split, Peak). Only Peak seems to work. If I select a different one, for example Split, there is a gray square in the center of the viewfinder, but nothing happens within the square when I manually focus. What am I missing?