Re: [ATM] Exit pupil and brightness

["Arjan te Marvelde" <Arjan.te.Marvelde@hetnet.nl>]

To detail on this:
Like the scope aperture stop, the eye pupil cuts off parallel rays, which 
contain only intensity as a function of angle, not loacation. The location 
will only substantiate in teh image plane, i.e. the retina. Therefore you 
would loose the edge of the field if you have a bad retina, the smaller 
pupil only affects intesity independent of the angle the light enters you 
eye.

.. Arjan

>> But what view is finally right ?
>>
>
> Theirs. *All* the parallel ray bundles for all of the objects
> in the field pass through the exit pupil, and all are vignetted
> by the eye's pupil. Losing the edge is when you have an
> aperture stop in a focal system (i.e. somewhere before the eyepiece,
> not one at the exit pupil of an afocal one.

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