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 ?
The payload consists of: - a 3 mirror off-axis afocal telescope (1.
Afocal one-piece (wraparound) protectors (see Figure 1) are the most basic of all types of safety eyewear.
Try the afocal method: aim your telescope at the Moon, focusing it by eye, hold your camera (even a cell phone) so it is pointing squarely into the telescope eyepiece, and take the shot.
The M98AI and A2 versions have different afocal assemblies.
The T-piece, to fit the camera for afocal photography was, made by Mr Steve Kleyn of the Hermanus Astronomy Centre.
The direction of research changed recently towards solar imaging, and images of the Sun were taken with a 150mm aperture Hypo fitted with a 'Thousand Oaks' trimetal front-end filter 127 mm diameter, a 'Ruby' coated optics 50 mm Plossl eyepiece, which suppresses the red fringe generated by the LCA, and a Nikon 'Coolpix' camera at the afocal position.
A significant performance improvement in the Block I CLU is an increase in target identification range through use of a larger afocal lens (12X vs 9X) plus the addition of electronic zoom capability.
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.
PHOTO : afocal module provides daylight observation, while the Gen 2 or Gen 3 tube is used at
Paper: "Reflective afocal broadband adaptive optics scanning ophthalmoscope" Biomedical Optics Express, Volume 2, Issue 6, pp.
The market is broken down into two legal lots Lot 1: Parabolic mirror out of short focal axis;Lot 2: Parabolic mirror out of 08 afocal axis.
03 The subjective effects of aniseikonia can be demonstrated by creating an afocal telescope in the trial frame.