posted on Sep, 20 2012 @ 03:00 PM
reply to post by Sublimecraft
I think I can trump you on the Viking lenses:
Wikipedia - The Nimrud Lens
When polishing gemstones by hand, the most likely shape usually conforms to a slightly rounded pebble. If the gemstone was transparent, it would soon
have been noted that it would magnify objects held close to the gem.
The aspherical nature of the viking lenses illustrates a high level of craftsmanship, not a high level of technical prowess. The lenses would have
been fashioned incrementally towards the desired optical properties until a suitable result was found. Once that shape was identified, it could be
copied over and over again.
The short focal length of the Visby lenses indicates that they were probably developed for reading by being placed onto the surface that held the
The extremely short focal length of these lenses and the way that they have been found mounted would indicate that they are unlikely to have been used
in a telescope.
Before 1021 AD, the muslim scholar Abu Ali al-Hasan ibn-al-Haitham (also known as Alhazen) of Basra
produced a work entitled the "Book of Optics" where he deduced much of modern optical theory using lenses and mirrors. This was about 100-200 years
before the Visby lenses were added into their mounts (although the lenses themselves may be older).
BTW, starred and flagged for some really great posts!
edit on 20/9/2012 by chr0naut because: (no reason given)