16
CX21
OPTICAL CHARACTERISTICS
Optical
Characteristics
Objectives
Power N.A .
W.D.
(mm)
Cover
Glass
Thickness
Resolution
(μm)
10X Eyepieces (FN 18)
Total
Power
Focal
Depth
(μm)
Actual
Field of
View
Remark
Plan objective (FN 22)
4X 0.10 18.5 – 3.36 40X 175.0 4.5
10X 0.25 10.6 – 1.34 100X 28.0 1.8
40X 0.65 0.6 0.17 0.52 400X 3.04 0.45
100XO 1.25 0.13 – 0.27 1000X 0.69 0.18
Oil immersed
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
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.
Magnification
Mechanical tube
length
Color band
Objective type (on the back side)
Number of aperture
Cover glass
thickness
Plan Objective
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