At 13:57 5/11/01, Arni wrote:
No, it's *apparent* distance. Your eyes are tricked into believing that they
are looking at a huge focusing screen ca. 2 meters away, I think. I could
explain it a lot better in Icelandic, but you'd probably just say "eh?". <g>
Arni
You did very well in English!
Chris,
The viewfinder optics are what make the apparent distance about 6 feet (two
meters). If it were 2cm (about 3/4 inch) your eye would not be able to
focus on the screen unless you were very, very myopic (e.g. "Mr. Magoo"
near-sighted).
It finally dawned on my why I require the -2 and -3 dioptric correction
lenses for my right and left eyes respectively (they are 1.25 diopter
different) instead of a -3 and -4 correction. My reading prescription is
+1 diopter for both eyes and the _apparent_ distance of the focus screen is
at the far end of the distance range for which I require reading
correction, not infinity correction. I believe this is why there are
sometimes mixed results in people trying to correlate the markings on the
Eyecup 1&2 correction lenses with their prescriptions.
What the markings actually mean can differ by manufacturer too. A -1
diopter Mamiya correction lens works perfectly for my right eye in the M645.
-- John
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