Olympus CX21 Руководство по эксплуатации - Страница 19
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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)
4X
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
16