Re: Proposed Splash for Official 2.2 (Swoosh A)

From: Ruth A. Kramer (
Date: Mon Apr 05 2004 - 03:35:52 EDT

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    Hubert Figuiere wrote:
    > On Mon, 2004-04-05 at 08:07, Randy 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 :-)

    Sorry, I did reply to Hub privately, with, in essence this same
    response: Hub is absolutely right about the depth of field, but I still
    think (am quite convinced) that a telephoto lens will help solve the
    problem -- at a greater distance you will minimize the depth of field
    required and avoid the geometry concerns Hubert mentions.

    And, I won't post on the subject (photography) again.

    Randy Kramer

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