Olympus CX33 User Manual

26
8 List of optical performances
The following table shows the optical
performances when combining eyepieces and
objectives.
The picture on the right shows the various
performances indicated on the objectives.
Glossary
Numerical aperture:
(NA)
The numerical aperture corresponds to F-number
* of the camera and is related to the resolution. The
resolution becomes higher when the numerical aperture becomes larger.
(*: F-number is a value obtained by dividing the focal distance of lens by the valid aperture diameter.
This is used as an index to show the brightness of the lens.)
Working distance:
(W.D.)
Distance between the top surface of the cover glass and the tip of the objective.
Resolution: The resolution is the ability of an objective to resolve adjacent two points in the image to the minimum
limit, which is expressed as the distance between two points on the specimen surface.
Field number:
(FN)
The field number is the diameter of the image viewed through eyepieces, indicated in millimeters.
Total magnification: Magnification of objective x Magnification of eyepiece
Focal depth:
(Object side)
The focal depth is the depth range of the specimen focused. The depth becomes deeper by
narrowing down the aperture diaphragm and it becomes shallower by increasing the aperture
diaphragm of the objective.
Actual field of view: The actual field of view is a diameter of the field of view, expressed as the size (mm) on the specimen
surface.
Magnification
Mechanical tube
length
Objective type (on the back side)
Plan objective
Color band
Numerical aperture
Field number
Cover glass thickness
Optical
performance
Objectives
Magnification
Numerical
aperture
NA
Working
distance
W.D.
(mm)
Cover
glass
thickness
(mm)
Resolution
(µm)
10X Eyepieces (FN 20)
Remark
Total
magnification
Depth of
focus
(µm)
Actual
field of
view
Plan objective
(FN 20)
4X
10X
20X
40X
100XO
0.10
0.25
0.40
0.65
1.25
27.8
8.0
2.5
0.6
0.13
-
-
-
0.17
-
3.36
1.34
0.84
0.52
0.27
40X
100X
200X
400X
1000X
175.0
28.0
9.27
3.04
0.69
5.0
2.0
1.1
0.5
0.2
Oil immersed

Olympus CX33 Specifications

General

Brand	Olympus
Model	CX33
Category	Microscope
Language	English