> Date: Tue, 4 Jun 2002 12:35:31 -0400 (EDT)
> From: Mark Dapoz <md@xxxxxxxxxxxx>
> Subject: Re: [OM] focusing screen questions
>
> On Tue, 4 Jun 2002, Marten Beels wrote:
>
> > Which brings me to the 1-11, how do
> > those cross hair focusing aids work? Neither my
> 2n
> > nor PC have diopters which the eSIF says need to
> be
> > adjusted to use this screen properly.
>
> The cross hairs are there as a focus reference point
> for your eye. The
> centre of the 1-11 and the entire 1-12 screen are
> clear. Focusing is
> done on an arial image of the subject. The eyes
> have a natural tendancy to
> wander if you stare at an image long enough, and
> with an arial image you
> may end up focusing on the wrong plane. By checking
> that the two parallel
> lines in the cross hairs are still visible, you
> ensure that your eye is on
> the correct plane.
> -mark
>
> ------------------------------
OK, thanks for the response. So having a diopter to
adjust is not strictly necessary?
Marten
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