16
CX22LED
OPTICAL CHARACTERISTICS
Optical
Characteristics
Objectives
Magnifi-
cation
N.A .
W.D.
(mm)
Cover
Glass
Thickness
(mm)
Resolution
(μm)
10X Eyepieces (FN 20)
Total
Power
Focal
Depth
(μm)
Actual
Field of
View
Remark
Plan objective (FN 20)
4X
0.10
27.8
–
3.36
40X
175.0
5.0
10X
0.25
8.0
–
1.34
100X
28.0
2.0
40X
0.65
0.6
0.17
0.52
400X
3.04
0.5
100XO
*
1.25
0.13
–
0.27
1000X
0.69
0.2
Oil immersed
Legend
Working distance (WD) :
Distance between the top surface of the 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
and larger NA means higher resolution.
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.
Focal depth :
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.
Field number (FN) :
The diameter of the image observed through an eyepiece, represented in millimeters.
Actual field of view :
Diameter of the field of view, expressed as the size on the specimen surface.
Total power :
Objective magnification x Eyepiece magnification.
(Total magnification)
(Object side) :
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.
*
100XO (FN 20)
Magnification
Mechanical tube
length
Color band
Objective type (on the back side)
Numerical aperture
Cover glass
thickness
Plan Objective
Field number
