Definition of Parfocal. Meaning of Parfocal. Synonyms of Parfocal

Here you will find one or more explanations in English for the word Parfocal. Also in the bottom left of the page several parts of wikipedia pages related to the word Parfocal and, of course, Parfocal synonyms and on the right images related to the word Parfocal.

Definition of Parfocal

Parfocal
Parfocal Par*fo"cal, a. [Pari- + focal.] (Opt.) 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.

Meaning of Parfocal from wikipedia

- A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but too small...
- focus changes as focal length (and magnification) changes, as compared to parfocal ("true") zoom lens, which remains in focus as the lens zooms (focal length...
- focal length (FFL) lens (see prime lens). A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. Most consumer...
- circular from f/4 to f/8. It is one of the few Canon photo lenses that are parfocal. The 17–40mm is the least expensive of Canon's current wide-angle zooms...
- focaccia, focal, focus, foyer, fuel, fusillade, multifocal, omnifocal, parfocal, refocus, refuel, trifocal, varifocal foedus foeder- confederate, confederation...
- select the required objective lens. These arrangements are designed to be parfocal, which means that when one changes from one lens to another on a microscope...
- the transparent medias of eye. Viewing arm and illuminating arm are kept parfocal. This type of illumination is useful for depth localization. Direct focal...
- without electronic control of the aperture or autofocus. In contrast, parfocal adaptation of EF lenses to non-EF camera bodies is not possible with only...
- that of primes. Note, many of today's wide range zoom lenses are not "parfocal"; that is, not true zooms. They are "varifocal" – the focus point shifts...
- treatment of tumors. A suggestion by Köhler led to the development of parfocal lenses which allow the specimen to remain in focus when changing objectives...
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