On Wed, 1 Dec 1999, Windrim, Brian wrote:
> The thing that I don't underestand is this:
>
> Olympus makes focussing screens (1-5, 1-6, 1-7, 1-12) that have *no* matte
> portion,
> i.e. there should only be an aerial image. How come you don't see the edge
> of the rear
> element, as you would with *no* screen installed in the camera?
The short answer is that you *do* see a severe fall-off of intensity at
the corners. At least, you do with a 1-7 and a 500 F8 mirror - it
becomes very obvious if you move your eye from the centre of the
viewfinder window.
--
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