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2. Lens speed - Wikipedia

   en.wikipedia.org/wiki/Lens_speed

   A fast , the Canon 50mm 1.4 (left), and a slower zoom lens, the Canon 18–55mm 3.5–5.6 (right); this lens is faster at 18mm than it is at 55mm. Lens speed is the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast ...

3. Helios (lens brand) - Wikipedia

   en.wikipedia.org/wiki/Helios_(lens_brand)

   Helios (lens brand) Helios 44-2 lens mounted on a Praktica MTL 5B. Helios 44M-4 lens, 58mm f/2, in M42 screw mount. Helios 40-2. Helios 81M 53mm f/2 lens mounted on Kiev 19. Helios ( Russian: Ге́лиос) was a type of camera lenses, made in the USSR. They were usually supplied with Zenit cameras and thus usable with other M42 lens mount ...

4. Objective (optics) - Wikipedia

   en.wikipedia.org/wiki/Objective_(optics)

   Several objective lenses on a microscope. Objective lenses of binoculars. In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.

5. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia.

6. Spherical aberration - Wikipedia

   en.wikipedia.org/wiki/Spherical_aberration

   In optics, spherical aberration ( SA) is a type of aberration found in optical systems that have elements with spherical surfaces. This phenomenon commonly affects lenses and curved mirrors, as these components are often shaped in a spherical manner for ease of manufacturing. Light rays that strike a spherical surface off-centre are refracted ...

7. Samyang Optics - Wikipedia

   en.wikipedia.org/wiki/Samyang_Optics

   Samyang Optics. Samyang Optics is a South Korean manufacturer of camera lenses for several major brands of third-party mounts for still photography and video cameras. The company was founded in 1972 and has about 150 employees. Samyang exports to 58 countries through 39 overseas agents and distributors. In July 2023, Samyang joined the L-Mount ...