[Leica] The ever-popular lens fingerprint/3D thing

[rpalmier at depaul.edu (Bob Palmieri)]

Folks...

Since this issue persists, to the fascination of some and consternation 
of others, let me say that I'm often unsure of which of two "3-D" 
effects, each basically the opposite of the other, shooters refer to.

One, a property of, say, the 35 ASPH 'Cron wide open, or one of the APO 
teles is the stark separation of the in-focus subject sharply separated 
from the background by acute edge transitions.  The other, a property 
of, say, the 35 4th gen, wide open, or the collapsible 'Cron is the 
shaded transition of  edges (due to aberrations) which gives them a 
kindof  "roll" and a "sculpted" effect.

In addition to these modes of rendering, others say that what really 
works is the ability to render very subtle transitions of grey zones.

Bob Palmieri