(number on the aperture ring)
1Aperture — For other uses, see Aperture (disambiguation). f stops demonstrated on a lens …
2History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
3History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …
4Encyclopedia of the Brethren of Purity — The Encyclopedia of the Brethren of Purity (Arabic: رسائل أخوان الصفا و خلان الوفا Rasa il ikhwan as safa wa khillan al wafa; also variously known as the Epistles of the Brethren of Sincerity , Epistles of the Brethren of Purity and Epistles of… …
5Cryptanalysis of the Enigma — enabled the western Allies in World War II to read substantial amounts of secret Morse coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from… …
6Evolution of the eye — The evolution of the eye has been a subject of significant study, as a distinctive example of a homologous organ present in a wide variety of taxa. The development of the eye is considered by some experts to be monophyletic; that is, all modern… …
7Land of the Lost (1974 TV series) geography and technology — Land of the Lost was a 1974 1976 TV series presenting the adventures of the Marshall family (including Will and Holly and their father Rick, later replaced by their uncle Jack). The Marshalls become trapped in a pocket universe populated by… …
8Telecommunications industry in the People's Republic of China — This article discusses the telecommunications industry in mainland China. For Hong Kong and Macau, see Communications in Hong Kong and Communications in Macau. The telecommunications industry in China is dominated by three state run businesses:… …
9Magic: The Gathering World Championship — Magic: The Gathering World Championships Year Winner Held in 1994 Zak Dolan Milwaukee, WI, USA 1995 …
10Pentax K mount — The Pentax K mount, sometimes referred to as the PK mount , is a lens mount standard for mounting interchangeable photographic lenses to 35 mm single lens reflex (SLR) cameras. It was created by Pentax in 1975, [cite web | url =… …
