[Leica] Question: Depth of field for a Noct. on a digital M

[reid at mejac.palo-alto.ca.us (Brian Reid)]

A lens has no idea what it is focusing the light on, whether film, sensor, 
or SLR screen. Ignoring issues like grain and digitization noise, the image 
that a Noctilux puts onto a sensor is exactly the same as the image that it 
puts onto a piece of film that is the same size and shape and is in the same 
location.

If you shoot an image with a Digital M using a Noctilux,
and then shoot another image with the same lens using an M7,
and then you scan the M7's film and crop the scan so that the area that it 
shows is identical to the area covered by the Digital M's sensor,
then the images will have the same depth of field. It's not possible for it 
to work any other way.