Matt is correct that the screen is very close to
your eye, that is why the eyepiece is a magnifier. I
think that the OM-1 viewfinder system is set up so
that the screen is at an apparent distance of 1 meter,
so if you hold, say a poster at 40 inches from your
eye and can see it clearly you should be able to use
an OM -1/2 wiewfinder without correction. If, on the
otherhand you need to use your glasses to see the
poster clearly, then you would use them with the
camera also. The OM-3/4 have adjustable diopter
eyepieces that can be set to compensate for simple
nearsighted or farsightedness. This is my
understanding of this subject but I would imagine
Susan(The Eye Guy) could no doubt provide a more
concise explaination. John Robison
--- Matt Bachofen <bachofen@xxxxxxxxxxxxxx> wrote:
> Hello list,
> I'm really confused about focus and diopters.
> My knowledge of optics
> amounts practically nil compared to most of ya'll,
> but I thought that when
> an image is focused on the screen it is a "real
> image" So isn't it only
> about an inch from your eye? Aren't near sighted
> people still able to focus
> correctly on a screen with no correction? I
> understand that they can't see
> the tree way out there, but when it's in focus on
> the screen, shouldn't it
> be just_as_in focus as if they were looking at these
> letters from about one
> inch?
>
> maybe its too many martinis
> m.e.b.
>
>
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