Hi guys, I need more information on the Leica SF 20 flash. Some questions I have ... How does the TTL operate on an M6 TTL camera? Do I get exposure compensation with TTL? Do I get exposure compensation with auto (aperture) mode? Is the TTL flash slow/visible (like the 24D on the M8/M9)? (unlike the instantaneous TTL with the pro-dSLRS) The 123A batteries ain't much of a problem, since I'm also planning to get some Surefire flashlights. My main purpose of this flash is to use it in minimal-light situations, indoors, and situations when I need it. It needs to be quite compact, with some considerable degree of control. Thus the Leica SF 20 fits my needs perfectly.