Olympus BX-RLA2 Manuale di istruzioni - Pagina 28

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Glossary of Terms Used in the Optical Characteristics Table

Working distance (WD)

Number of aperture (NA) : Important figure determining the objective characteristics (resolution, focal depth and bright-

Resolution

Depth of focus

Field number

Field of view

: The distance from the top of specimen and the front lens of objective.

ness).

Resolution ............. Increases in proportion with the NA.

Focal depth ......... Decreases in proportion with the NA.

Brightness ............. Proportional with the square of NA (comparison under the same magnification).

: The limit that an objective can identify the images of two points that are close to each other,

expressed as the distance between the two points on the specimen.

: The maximum depth of the specimen at which the entire specimen can be brought into focus

simultaneously. This value increases when the aperture iris diaphragm is narrowed and de-

creases when the objective NA is increased.

: The diameter of the image area that can be observed through the eyepieces, expressed in mm.

: The diameter of the area observable on the specimen, expressed in mm.