[Leica] "focus then reframe" (aka fungus in camera)

[feli at creocollective.com (Feli di Giorgio)]

Obviously no one in their right mind is going to calculate these things 
on the fly while they are taking the shot and I highly doubt that really was
the intent of the Jean's post. It's a tidbit of scientific information that
some may find interesting and makes the eyes of others glaze over. 

Feli