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Definition of Parfocal
1. a. With the lower focal points all in the same plane; -- said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used.
Definition of Parfocal
1. Adjective. Having multiple lenses that have corresponding focal points in the same plane ¹
¹ Source: wiktionary.com
Definition of Parfocal
1. having lenses with the corresponding focal points in the same plane [adj]
Lexicographical Neighbors of Parfocal
Literary usage of Parfocal
Below you will find example usage of this term as found in modern and/or classical literature:
1. Microscopical Praxis: Or, Simple Methods of Ascertaining the Properties of by Alfred Cheatham Stokes (1894)
"The Latin name, parfocal or equal focus, explains the special quality of these
... I have never had the pleasure of examining parfocal eye-pieces with this ..."
2. The Microscope: An Introduction to Microscopic Methods and to Histology by Simon Henry Gage (1917)
"parfocal oculars and focusing. — On changing the oculars from a higher to a lower
or the reverse it is necessary to refocus the microscope. ..."
3. The Microscope: An Introduction to Microscopic Methods and to Histology by Simon Henry Gage (1920)
"parfocal oculars and focusing. — On changing the oculars from a higher to a lower
or the reverse it is necessary to refocus the microscope. ..."
4. Laboratory Manual in General Microbiology by Dept. of Bacteriology and Public Health, Michigan, Michigan State University, East Lansing Agricultural College, Dept. of Bacteriology and Hygiene (1916)
"Nose-pieces and objectives of the best makes are now made so that the objectives
are parfocal, ie, when one lens is in focus the others on the nose-piece ..."
5. Animal Micrology: Practical Exercises in Zoölogical Micro-technique by Michael Frederic Guyer (1917)
"This is very likely to happen if the objectives are not parfocal. When objectives
are not parfocal they maj- usually be made so by putting a paper or ..."
6. Journal of Applied Microscopy by Bausch & Lomb Optical Company (1903)
"All parts of the nosepiece must be carefully made and adjusted, and it is presumed
that the objectives have been centered and made parfocal with each other; ..."
7. Pathogenic Micro-organisms: Including Bacteria and Protozoa; a Practical by William Hallock Park, Anna Wessels Williams (1910)
"It is too much to ask of the maker that the lenses be made absolutely parfocal
and centred. The delicacy of the centring can be appreciated when the ..."
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