Re: [ATM] Entrance, exit pupils-

[Alexis Cousein <al@sgi.com>]

Dominic-Luc Webb wrote:
> I assumed I was following the nomenclature rules by setting the
> entrance pupil of a Newt at its focal length. The diameter of
> this entrance pupil can be anything from a pinpoint to the
> diameter of the mirror because an adjustable aperture stop
> is situated there. Am I wrong?

That's just it - normally on a Newt there isn't an adjustable stop
one focal length *in front* of the mirror (i.e. constricting
the incoming light bundles).

The first aperture stop tends to be the mirror itself.

-- 
Alexis Cousein                                  al@sgi.com
Senior Systems Engineer/Solutions Architect     SGI/Silicon Graphics
--
<If I have seen further, it is by standing on reference manuals>

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