RE: [Leica] Depth of field summary with regard to the argument at hand

["Austin Franklin" <austin@darkroom.com>]

> The problem of being unable to see small characters on the
> eye chart is not
> a matter of focus, assuming your vision is good, but of the
> eye being unable
> to resolve the small characters. If the eye was not focused
> on the chart,
> then you would have trouble seeing the large characters as well.

Even if you take your camera, and de-focus it on a newspaper just enough so
you can discern the larger letters, and not the smaller ones, you still have
the same focus, it's just the size of the object, in this case, the letters,
that is different...same plane of focus.  Technically, it's a resolution
issue.

> I am not sure I can correctly follow your example of the
> tree. It seems that
> you are photographing the tree from different angles.

One tree, one angle...up.

> Please elaborate
> if I have misunderstood your example.

You have.  I think the defocused newspaper will suffice as an example.  I
would suggest the use an SLR not an M for that example ;-)