From: Hubert Figuiere (hfiguiere_at_teaser.fr)
Date: Mon Apr 05 2004 - 09:15:16 EDT
On Mon, 2004-04-05 at 08:07, Ruth A. Kramer wrote:
> * One way of trying to enhance the focus of the entire pen point is
> by use of a longer focal length lens (telephoto) and more light (to use
> a smaller aperture).
For the first point, you are wrong.
The depth of (DOF) in *inversely proportionnal*[1] of the focal lenght
of the lens. So if you want to get the longer DOF with the same focus
distance and the same aperture, you must take a shorter lens (ie wider
angle). Off course this lead to some geometry concerns...
That said, this is getting off-topic, so if you want to discuss
photography techinque, do this privately :-)
Hub
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