There was this, too, in the roll of TMax from 2009. I have a correction: it was not the M6 neither the Summilux - for a brief period I was the owner of an M3 with the Summicron 50 collapsible. A heck of a camera, but never really got along with it...
@golftragic Thanks, Marnie!
@helenhall Indeed, I love the way new sense comes out.