Internal photographic lens controllers take information from the camera or lens elements and perform automatic and manual focusing and aperture adjustment. They are frequently contained inside as part of a modern zoom lens and used mainly for photography.
Stand-aloneedit
Stand-alone lens controllers are attached to a photographic lens by a cable to allow operator manual control of lens functions.
Machine vision, CCTV, and computer visionedit
Lens controllers for machine vision are universal devices designed to control lenses from multiple manufacturers. Although there is no standard for wiring of lenses most have direct current (DC) motors attached to lens elements and are controlled with ±6 VDC, ±8 VDC or ±12 VDC.
Machine vision lens controllers come in manual or computerized varieties.
Manual lens controllers are composed of switches and a power supply. When the operator actuates a switch, a function of the lens is enabled. Manual control requires an operator to view the image through the lens in which adjustment is taking place. Manual lens controllers are the most common and are frequently used in CCTV security systems.
Computerized lens controllers are composed of a computer, electronic switches such as H-Bridges or relays, a power supply, and an electronic interface. A remote computer sends a command to the lens controller through an RS-232, RS-485, USB, or Ethernet interface to actuate a lens function. The lens controller will then perform the command automatically. If a lens is equipped with presets, potentiometers attached to lens components that measure the position of that function, then the controller can work in a closed loop and move to a specific position. If the lens is not equipped with presets, then the controller can only move a lens function to an approximate position.
Referencesedit
^Kruegle, Herman (2006). CCTV Surveillance: Video Practices and Technology (2nd ed.). Butterworth-Heinemann. ISBN9780750677684.
April 13, 2024
lens, controller, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, april, 20. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Lens controller news newspapers books scholar JSTOR April 2011 Learn how and when to remove this template message A lens controller is device that controls motorized photographic lens functions such as zoom focus and iris opening aperture 1 Lens controllers can be found in still camera photographic lenses and as stand alone units in machine vision remote sensing optoelectronics systems and security applications Contents 1 Types 1 1 Internal 1 2 Stand alone 1 3 Machine vision CCTV and computer vision 2 ReferencesTypes editInternal edit Internal photographic lens controllers take information from the camera or lens elements and perform automatic and manual focusing and aperture adjustment They are frequently contained inside as part of a modern zoom lens and used mainly for photography Stand alone edit Stand alone lens controllers are attached to a photographic lens by a cable to allow operator manual control of lens functions Machine vision CCTV and computer vision edit Lens controllers for machine vision are universal devices designed to control lenses from multiple manufacturers Although there is no standard for wiring of lenses most have direct current DC motors attached to lens elements and are controlled with 6 VDC 8 VDC or 12 VDC Machine vision lens controllers come in manual or computerized varieties Manual lens controllers are composed of switches and a power supply When the operator actuates a switch a function of the lens is enabled Manual control requires an operator to view the image through the lens in which adjustment is taking place Manual lens controllers are the most common and are frequently used in CCTV security systems Computerized lens controllers are composed of a computer electronic switches such as H Bridges or relays a power supply and an electronic interface A remote computer sends a command to the lens controller through an RS 232 RS 485 USB or Ethernet interface to actuate a lens function The lens controller will then perform the command automatically If a lens is equipped with presets potentiometers attached to lens components that measure the position of that function then the controller can work in a closed loop and move to a specific position If the lens is not equipped with presets then the controller can only move a lens function to an approximate position References edit Kruegle Herman 2006 CCTV Surveillance Video Practices and Technology 2nd ed Butterworth Heinemann ISBN 9780750677684 Retrieved from https en wikipedia org w index php title Lens controller amp oldid 1127145840, wikipedia, wiki, book, books, library,
