> Moose <olymoose@xxxxxxxxx> wrote:
>
> I suspect this in not true in practice because of compromises in the
> design of MF viewfinders. I suspect the problems of size, weight and
> cost go up with something like the cube of the film diagonal with
> pentaprism finders. The penta prism is much bigger and the eyepiece
> optical system has to cover a much greater area. The eyepieces are
> probably also slower for size/cost reasons.
>
As an example, the eyelevel prism for my Mamiya RB-67 weighs >1kg, what is the
weight of an OM prism ? The RB-67 film size is roughly 2x the linear
dimensions of 35mm.
Also viewfinder brightness is not the only aspect to consider in relation to
ease of focussing. For example I find that when there is adequate light an OM
1-4 screen "snaps" into focus better than a 2-4 which I believe has to do with
the "graininess" of the screen.
...Wayne
Wayne Harridge
http://lrh.structuregraphs.com
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