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OPTICAL CHARACTERISTICS

The following table shows the optical characteristics of com-

binations of eyepieces and objectives. The figure on the right

shows the performance data engraved on the objectives.

Optical

Characteristics

Objectives

Plan objective (FN 22)

Legend

Working distance (WD) : Distance between the top surface of cover glass and the objective extremity.

Number of aperture (NA) : The figure corresponding to the F-number of the camera. This is associated with the resolution

Resolution :

Focal depth :

(Object side) :

Field number (FN) :

Actual field of view :

Total power :

(Total magnification)

W.D.

Power

N.A .

(mm)

0.10

18.5

10X

0.25

10.6

40X

0.65

0.6

100XO

1.25

0.13

and larger NA means higher resolution.

Ability of an objective for identifying adjacent two lines in the image, which is expressed in terms

of the minimum distance between two points on the specimen surface.

The depth range of a specimen, in which focusing is obtained at a time. Stopping down the

aperture iris diaphragm increases the focal depth and increasing the objective NA decreases it.

The diameter of the image observed through an eyepiece, represented in millimeters.

Diameter of the field of view, expressed as the size on the specimen surface.

Objective magnification x Eyepiece magnification.

Magnification

Mechanical tube

length

Color band

Objective type (on the back side)

Plan Objective

10X Eyepieces (FN 18)

Cover

Resolution

Glass

Total

(μm)

Thickness

Power

–

3.36

40X

–

1.34

100X

0.17

0.52

400X

–

0.27

1000X

CX21

Number of aperture

Cover glass

thickness

Focal

Actual

Remark

Depth

Field of

(μm)

View

175.0

4.5

28.0

1.8

3.04

0.45

0.69

0.18

Oil immersed