parfocal


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parfocal

(pɑːˈfəʊkəl)
adj
(General Physics) optics (of a lens) maintaining focus even if magnification is changed
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
Like other high-end cine lenses, the MK18-55 operates as a parfocal lens.
Meade also claims the MWA series are parfocal, meaning that they reach focus at the same point.
This effectively doubles your reach, and reach on a Super 35mm camera with a parfocal and fixed-aperture lens beyond 200mm (300mm after crop factor considerations) has few options.
A 60mm parfocal distance and a much larger barrel diameter allows these objectives to offer increased brightness and the highest possible combination of working distance and numerical aperture (for light-gathering ability).
The Vinden CZ 640 has a 35 -105 mm continuous-zoom parfocal lens with a 3x optical zoom, 4x digital zoom, and horizontal field of view (HFOV) from 17.1 degrees to 1.5 degrees.
Designed for researchers who previously needed to align two cameras to a dual port, the system is essentially two complete, high-performance parfocal and parcentric cameras in one.
The intuitive interface, proprietary light cubes, dual cameras, precision automated stage and parfocal optical system enables users to produce publication-quality images in seconds.
The H3-ZA offers a parfocal zoom function to provide 2x zoom without refocusing.
Such an action provides evidence that the student knows the microscope is parfocal. I can usually fill in Blanks 7 and 8 at the same time.
The optical system's range of achromatic and planachromatic objectives are parfocal and parcentered.
The different objectives are designed to be parfocal, and therefore require only fine adjustment of focus when rotated.