Re: [Leica] depth of focus

["Bill Larsen" <ohlen@lightspeed.net>]

I thought I said that depth of focus dealt with the lens to film plane
distance while depth of field dealt with what is front of the camera.  The
differentiation becomes important when you start to teach enlarging and try to
explain how to manipulate parallel or not parallel planes between the film and
the enlarging surface (be it film or paper).

Regards, Bill the inarticulate

Kevin writes:


|Bill,
|Having been a student, I think you will confuse your students by using 'depth
of
|focus'  for depth of field.  I think students can grasp the 'depth of field'
|concept, and if this is a new term for them, isn't that what 'teaching' is
|about?  Keep 'depth of focus' in the camera.
|
|Bill Larsen wrote:
|
|> Henry Ambrose writes:
|>
|> |So hows this for a statement using "depth of focus" in a teaching
|> |situation -
|> |
|> |I'd say something like this:
|> |
|> |"What I mean by depth of field is maybe simpler to think of as depth of
|> |focus, the area in your picture that is in focus. This is in a plane that
|> |is perpendicular to your lens and parallel to the film. "
|>
|> What wrong with it is that it misdefines depth of focus  --- then you are
|> going to have to explain why your definition is different than everyone
|> else's.
|