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A helicoid with α = 1, −1 ≤ ρ ≤ 1 and − π ≤ θ ≤ π. The helicoid , also known as helical surface , is a smooth surface embedded in three-dimensional space . It is the surface traced by an infinite line that is simultaneously being rotated and lifted along its fixed axis of rotation.
generalized helicoid: meridian is a parabola. In geometry, a generalized helicoid is a surface in Euclidean space generated by rotating and simultaneously displacing a curve, the profile curve, along a line, its axis. Any point of the given curve is the starting point of a circular helix.
The Zeiss Hologon is an ultra wide-angle f=15mm f / 8 triplet lens, providing a 110° angle of view for 35mm format cameras. The Hologon was originally fitted to a dedicated camera, the Zeiss Ikon Contarex Hologon in the late 1960s; as sales of that camera were poor and the Zeiss Ikon company itself was going bankrupt, an additional 225 lenses were made in Leica M mount and released for sale ...
An einzel lens (from German: Einzellinse – single lens [1]), or unipotential lens, [2] is a charged particle electrostatic lens that focuses without changing the energy of the beam. It consists of three or more sets of cylindrical or rectangular apertures or tubes in series along an axis.
A burning apparatus consisting of two biconvex lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
The body has a built-in focusing extension for lenses that use the inside bayonet, so these lenses do not need to have a focusing helicoid built into the lens barrel. As a consequence, the 5 cm f /1.4 lens that was normally sold with the body is extremely small (about the size of a golf ball) since the lens contains only the optics and aperture ...
Holographic optical element (HOE) is an optical component (mirror, lens, directional diffuser, etc.) that produces holographic images using principles of diffraction.HOE is most commonly used in transparent displays, 3D imaging, and certain scanning technologies.
Zuiko (Japanese: ズイコー or 瑞光) is a brand of optical lenses [1] made by Olympus Corporation that was used up to and into the Four Thirds system era. The name Zuiko (瑞光) means 'Holy Light', using a character from the Mizuho Optic Research Laboratory (瑞穂光学研究所), where the lens was developed, and a character from Takachiho Corporation (高千穂製作所), which would ...
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