20
OPTICAL CHARACTERISTICS
The following table shows the optical characteristics of
combinations 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
Number aperture (NA)
Cover glass thickness
Optical Characteristics
Legend
Working distance (WD):
Numerical aperture (NA):
Resolution:
Focal depth(Object side):
Field number (FN):
Actual field of view:
Total power (Total magnification):
Magnifi-
cation
NA
WD
(mm)
Cover Glass
Thick-ness
(mm)
Resolution
(µm)
WHN10X (FN 22)
Remark
Objectives
Total
Mag.
Focal Depth
(µm)
Field of
View
PlanN-P Plan Achromat for
polarized light (FN 22)
AchN-P Achromat for polarized
light (FN 22)
4X 0.10 18.5 – 3.36 40X 180.0 5.5
10X 0.25 6.0 – 1.34 100X 28.0 2.2
20X 0.40 3.0 0.17 0.84 200X 6.09 1.1
40X 0.65 0.45 0.17 0.52 400X 3.04 0.55
100XO 1.25 0.13 0.17 0.27 1000X 0.69 0.22
Oil
immersion
Distance between the top surface of cover glass and the objective front lens.
The figure corresponding to the F-number of the camera. This is associated with the resolu-
tion 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.
Product of:Objective magnification x Eyepiece magnification.
Eyepieces
Field number (FN)
– UIS series objectives not listed here can also be combined with this microscope. –
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