Ottica - Lenti - Cannocchiali

... sottile, ma efficace!

Qualcuno sa qualcosa? Grazie
MaVir

Mi sembra di aver proposto questo articolo in passato ma non riesco a trovare la discussione che lo contiene :

"The earliest known lenses had their origin in Egypt at the beginning
of the Fourth Dynasty when they were employed in Egyptian statuary.
These lenses were of amazing quality and complexity with no known
precursors. The first lenses in this group are dated (about) 2620 BCE.
These were constructed of fine grade rock crystal or crystalline quartz
(#7 on the Mohs hardness scale). Examples of these lenses were used
until about 2400 BCE, after which they disappeared. Oddly, they
reappeared briefly about seven hundred years later during the Twelfth
Dynasty, after which they were gone forever in this form. Today, they
can be seen in Egyptian statues in museums in Cairo, Paris and Leipzig.
The lenses had a front (rather flat) convex surface simulating the cornea
of the associated "virtual" or schematic eye, and they were parts of
distinguished funerary statues. The same optical elements also had a
small high power concave lens ground into the middle of the flat rear
lens surface located in the plane of the aperture of the pupil. Associated
with these lenses was a strong optical illusion causing the eye to appear
to follow the viewer as he/she moves about the statue in any direction.
This illusion has been characterized (and now measured) by the
author. Two lenses in this series at the Louvre (the right eye of Le
Scribe Accroupi, E3023, and Reserve eye, E3009) were recently
optically assessed by him and coworkers."

Prof. Enoch published on the subject in:

"First known lenses originating in Egypt about 4600 years ago,"
Documenta Ophthalmologica 99, no. 3 (November, 1999): 303-314,
revised and corrected July 2006.

Trovata la discussione..... è questa egittophilia.freeforumzone.leonardo.it/discussione.aspx?idd...

Grazie mille,
adesso ne so decisamente di più del mio "nulla" di prima.
Mi chiedo:
1. Dove è possibile vedere (quale museo) queste lenti?
2. E' possibile che gli Egizi avessero qualcosa che possa apparentarsi con un canocchiale?
3. Se sì, qualcuno ne sa qualcosa?
Grazie mille se qualcuno vorrà rispondermi
MaVir

Non so di lenti per uso cannocchiale, però posso indicare questa famosissima statua (E 3023- museo Louvre)il cui occhio destro secondo il prof. Enoch è strutturato col tipo di lente descritta nell'articolo precedente.