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parfocal
Once the object is in focus with lowest power, it should also be almost in focus with the higher power.
the magnifyings system include the eye piece i.e. ocular lens and objective i.e. parfocal lenses
disadvantage of papaya disadvantage of papaya
Parfocal microscopes are made so you don't have to refocus when you change between magnifications. Having a parfocal microscope is convenient and is easier on the eyes.
A "parfocal" microscope maintains its position as objectives are changed.
It's Parfocal property."Parfocal: This is a focus issue. When changing from one objective to another, the new image should be either in focus or close enough so that you can refocus with only minor adjustments. Most microscopes are parfocal." from www.microscope-microscope.org
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 refocusing. * When the distance from the object to the rear principal plane of each lens is equal, they are said to be parfocal.
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parfocal
Once the object is in focus with lowest power, it should also be almost in focus with the higher power.
THE disadvantage of using high power objective is to
The advantage of a parfocal microscope=when different objective lenses are rotated, the object being examined will remain in view
parfocal
Microscope lenses that are parfocal and parcentric allows the user to changed between lenses will keeping the speicemen focused and centered, instead of having to adjust the x, y or z plane (i.e. focus and the stage).
it is parfocal
parfocal