coralnut wrote:
are those shutters particularly frail?
They're made of cloth, not metal, so you can burn holes in them easily. Not sure if the M6 uses a cloth shutter, but my M2 does. My Canon P has a metal shutter so I don't worry about it as much although I've been told that even that can be damaged if you point it at the sun with the lens stopped down. That has the same effect as focusing a magnifying glass on a piece of paper: it starts to burn.