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2. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye. A telescope , which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image closely with a smaller eyepiece lens, thus making the ...

3. Pentax DA 12-24mm lens - Wikipedia

   en.wikipedia.org/wiki/Pentax_DA_12-24mm_lens

   smc PENTAX DA 12-24mm F4.0 ED AL (IF) Maker: Pentax: Technical data; Type: Zoom: Focus drive: Screwdrive: Focal length: 12-24mm: Focal length (35mm equiv.) 18-36mm: Aperture (max/min) Constant f/4 wide open, f/22 at narrowest: Close focus distance: 12 inches (30 cm) Max. magnification: 0.12: Diaphragm blades: 8: Construction: 13 elements in 11 ...

4. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...

5. Wray (lenses) - Wikipedia

   en.wikipedia.org/wiki/Wray_(lenses)

   Wray (Optical Works) Ltd. was a British camera and lens manufacturer based in Ashgrove Road, Bromley, Kent, UK.It operated from 1850 to 1971, making lenses for cameras, photographic enlargers, reconnaissance, mapping, microchip replication, and an anamorphic projection system for cinemas.

6. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

7. Refracting telescope - Wikipedia

   en.wikipedia.org/wiki/Refracting_telescope

   This 12-inch (30 cm) refractor is mounted in a dome on a mount that matches the Earth's rotation. The next major step in the evolution of refracting telescopes was the invention of the achromatic lens , a lens with multiple elements that helped solve problems with chromatic aberration and allowed shorter focal lengths.