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2. Scope mount - Wikipedia

   en.wikipedia.org/wiki/Scope_mount

   Among scopes for rail mounts, the 22.5-degree V-shaped Zeiss rail is the most prevalent standard. It was introduced in 1990. After the patent expired in 2008, compatible scopes have been offered from manufacturers such as Blaser, [1] Leica, Minox, Meopta, Nikon, [2] Noblex (formerly Docter [3]), Schmidt & Bender [4] and Steiner. [5]

3. Prong setting - Wikipedia

   en.wikipedia.org/wiki/Prong_setting

   A prong set diamond in a gold ring.. Prong setting or prong mount refers to the use of metal projections or tines, called "prongs", to secure a gemstone to a piece of jewelry.A prong setting is one component of what is known to jewelers as a head, a claw-shaped type of binding (typically three, four, or six individual prongs per head) that is welded or soldered to a jewelry item to mount (or ...

4. Lens mount - Wikipedia

   en.wikipedia.org/wiki/Lens_mount

   45.5 mm 35 mm: 48 mm Bayonet Photography Yashica/Contax: Yashica MA ~45.8 mm 35 mm: Bayonet Photography Kyocera Yashica 230 AF etc. Fujica X: 43.5 mm 35 mm: 49 mm Bayonet Photography Fujica-X: Fujifilm X: 17.7 mm APS-C: 44 mm Bayonet Photography (Digital) Fujifilm X series mirrorless Olympus Pen F: 28.95 mm 35 mm half-frame Bayonet Photography ...

5. Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_4.5mm_f/2.8_EX_DC...

   The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. It is a circular fisheye lens , designed to project a 180-degree field of view in all directions onto a circular image.

6. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   Ultimately, the De Beers campaign sought to persuade the consumer that an engagement ring is indispensable, and that a diamond is the only acceptable stone for an engagement ring. [33] The sales of diamonds in the United States rose from $23 million to $2.1 billion between 1939 and 1979.

7. Flange focal distance - Wikipedia

   en.wikipedia.org/wiki/Flange_focal_distance

   Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...