Topic: Parfocal
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What is Parfocal?
A parfocal is a type of lens that is used to help a microscope stay in focus. This is used when the magnification level is changed since it disrupts the clarity. For more information look here: http://en.wikipedia.org/wiki/Parfocal_le... Read More »
Source: http://answers.ask.com/Science/Physics/what_is_parfocal
What does Parfocal Mean?
When a lens is described as parfocal, that means that is remains in focus even when the focal length or magnification changes. So, when a microscope with a parfocal lens is switched from a lower power objective to a higher power objective, ... Read More »
Source: http://answers.ask.com/Science/Physics/what_does_parfocal_mean
How to Focus a Parfocal Microscope
Most compound light microscopes in use today are parfocal microscopes, which remain in focus or close to focus as different objective lenses on the nosepiece are rotated into place. This allows a specimen to be focused at the lowest magnifi... Read More »
Source: http://www.ehow.com/how_7416547_focus-parfocal-microscope.html
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Parfocal
[pahr-foh-kuhl](a.) Of or pertaining to different eyepieces (of telescopes or microscopes) that all focus their images in the same plane, so that they can be interchanged without readjusting the instrument
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More Common Questions
Answers to Other Common Questions
Most professional microscopes contain multiple objective lenses on a rotating nosepiece to facilitate a quick change in the magnification of a slide specimen. Parfocal lenses are those that are oriented in such a way that the specimen remai...
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Source: http://www.ehow.com/about_5640149_desirable-microscope-objectives...
lenses: set up or arranged so that when one lens is changed for another, there is no change in focus. * Applied usually to turret mounted lenses e.g. on microscope; also in telescopes: ~ eyepieces: changing one for another does not require ...
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Source: http://wiki.answers.com/Q/What_is_a_parfocal_lens
The advantage of a parfocal microscope=when different objective lenses are rotated, the object being examined will remain in view
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Source: http://wiki.answers.com/Q/What+is+adventage+of+parfocal+lenses
It means that the image will remain in focus when changing from a lower - power objective lens to higher power lens. Only minimal focusing should be necessary with the fine focus adjustment.
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Source: http://wiki.answers.com/Q/What_is_microscope_parfocalization
( pär′fō·kəl ′ī′pēs·əz ) (optics) Eyepieces whose lower focal points lie in the same plane, so that they can be interchanged without changing the focus of the instrument with which they are used.
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Source: http://www.answers.com/topic/parfocal-eyepieces
When a microscope is parfocal it will stay in focus when the magnification is changed.
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Source: http://wiki.answers.com/Q/What_does_it_mean_the_microscope_is_par...
