Olympus BHT-312 Manuel d'instruction - Page 18

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o Resolving power:
o F oc al de pth:
o F i e l d n u m b e r :
* lmmersion objectives
The resolving Power and
Technical terms:
o Wor k in g dis tanc e:
o N um er ic a l a per ture :
focal depth are obtained with fully opened aperture diaphrag
The distance from the cover glass to the nearest point of the
objective.
The N.A. represents a performance number which can be com
pared to the relative aperture (f-number) of a camera lens. The
N.A. values can be used for directly comparing the resolvin
powers of all types of objectives. The larger the N.A., the highe
resolving power.
Th e ab i l i t y of a l en s t o r eg i st er sm al l de t a i l s. Th e r eso l vi ng p ow e
of a lens is measured by its ability to separate two points.
The distance between the upper and lower limits of sharpness i
the image formed by an optical system. As you stop down th
aperture iris diaphragm, the focal depth becomes larger. Th
larger the N.A. of an objective the shallower the focal depth
A number that represents the diameter in mm of the image o
the field diaphragm that is formed by the lens in front of it
o Field of view diameter: The actual size of the f ield of view in mm on the object surfac
i.il
tii
l r l
1 , ,
Objective
Eyepiece
Type
D Achromat
D P l a n A c h .
M a g n i f i -
cation
4 X
1 0 x
40x
1 0 0 x *
4 X
1 0 x
40x
1 0 0x*
N.A.
0 . 1 0
o.25
0.65
1 . 3 0
0 . 1 0
o.25
0.65
1 . 2 5
W . D . ( m m )
18.2
7 . 2
0.6
o.20
7.03
7.4
o.27
o . 1 7
Focal length
( m m )
30.03
1 6 . 9
4.58
1 . 9 1
34.23
1 7 . 5
4.67
1 . 7 5
Resolving
power (r)
3.36
1 . 3 4
o.52
o.26
3.36
1 . 3 4
o.52
o.27
W H K l O X
(Field
number
201
Total mag.
40x
1 0 0x
400x
1000x
40x
1 0 0x
400x
1000x
Focal
depth (p)
1 7 1 . 6
27.45
3.0
o.7
1 7 1 . 6
27.45
3.0
o.7
F i e l d o f
view (mm)
5
2
0 . 5
o.2
5
2
0.5
o.2
1 6