AmScope M620A Benutzerhandbuch - Seite 15

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M620 Series

Technical Terms & Concepts

Total Magnification

Total magnification of a microscope is calculated by the magnification of the objective multiplied by the

magnification of the eyepieces.

-Ex: (10x Eyepieces) x (4x Objective) = 40x Total Magnification

Field of View

Linear field of view of the eyepiece divided by the magnification of the objective

Numerical Aperture (N.A)

Calculated by n Sin α (max), the Numerical Aperture (N.A) is an important parameter that marks the

features of the objective and condenser's image quality and resolution. The "n" is a refractive index of the

medium (air or immersion cedar oil) between the objective lens and the specimen. The "α" is 1/2 of the angle

between the aperture on the objective and path of light. The larger the N.A, the higher the resolution of the

objective (and better quality of the image) is.

Object to Primary Image Distance

The distance between the object plane and the primary image plane. The conjugate distance is fixed.

Mechanical Tube Length

The distance between the objective shoulder and the ocular shoulder

Technical Parameters