Chuck Norcutt wrote:
>
> I've never understood this clear screen/aerial image
> business. Why is
> focusing the aerial image on the camera different from focusing the
> aerial image on a microsope or telescope?
>
When you look through a microscope (assuming that you do not have a camera
attached), it does not matter if the aerial image is exactly where the
manufacturer intended - you just adjust the focus to suit your eyes.
However, when a camera is involved, then you must get the aerial image
focused exactly on the cross-hairs, because the camera is designed so that
when the aerial image is focused on the cross-hairs, then the real image is
also focused on the film.
--
Alan Wood
http://www.alanwood.net (Unicode, special characters, pesticide names)
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