afocal


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afocal 

Refers to a lens or an optical system with zero focal power, i.e. in which incident rays entering parallel emerge parallel. See afocal lens; aniseikonic lens.
References in periodicals archive ?
Interestingly there were quite a number of afocal experiments that were conducted by both amateur and professional photographers in the late '80s and mid '90s.
Among the systems covered over the course of 43 chapters are telephoto lenses, eyepieces, afocal optical systems, periscope systems, enlarging and copying lenses, projection lenses, wedge-plate and rotary-prism cameras, optically and mechanically compensated zoom lenses, copy lenses with variable magnification, gradient-index lenses, spectrographic systems, and diffractive systems.
Two measurement configurations are accommodated for testing both high numerical aperture objectives and afocal relays.
The Mono offers 1X magnification in its baseline form, rising to 3X when an optional afocal adapter is attached.
PHOTO : afocal module provides daylight observation, while the Gen 2 or Gen 3 tube is used at
D-Stress is based on Safilens' patented afocal lens design for presbyopic patients, but is instead focused on reducing eye strain commonly associated with daily activities that overstress proximal vision.
The objective of those standards is to specify minimum requirements for sunglasses, fashion spectacles and replacement filters that are nominally afocal (plano power)excluding prescription filtersproviding protection against solar radiation for general use including road use and driving.
This optical arrangement--telescope, eyepiece, and a camera with an attached lens--is called afocal photography.
The Javelin CUU needs its specially designed case to protect parts like the hand grips, afocal lens, eyepiece, and battery case.
Since most consumer-level digital cameras have permanently mounted lenses, the only way to take images through a telescope is with the afocal method, whereby you aim the camera's lens directly into the telescope's eyepiece.
It accommodates a variety of accessories, including an IR-K2 Pro Extra Long-Range IR Illuminator, 3x or 5x Mil-Spec Afocal Night Vision Lens, iPhone and night vision camera adaptors, quick-release weapon mount, and more.