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(2) Eyepieces
Huygenian
Wide-fisld
-Iislg9e9, "!19ry9$4qq_
High €yepoint, compensating
wide-field
Type
T- noiu-iar"r
Table 6
Focal
Length
F i e l d
Number
Bemarks
H 5 X
5 0 m m
2 1 . O
H l O X
25mm
1 2 . O
H 1 5 X
1 6 . 7 m m
8 . 0
W F . I O X
25mm
1 8 . 0
50mm
2 1 . 0
W i t h a d j u s t a b l e e y e p i e c e c o l l a r
3 1 . 3 m m
W i t h a d j u s t a b l e e y e p i e c e c o l l a r
2 5 m m
1 8 . 6
r e-o
-l
W i t h a d j u s t a b l e e y e p i e c e c o l a r
!r!<w10x
H K W 1 5 X
1 6 . 7 m m
1 4 . Q
W i t h a d i u s t a b l e e y e p i e c e c o l l a r
Diopter adiustable high eyepoint,
DH KW10X
compensating, wide-field
Bi
Filar micrometsr
eyspiece model 2
2 5 m m
1 8 . 0
W i t h 5 X , 1 0 X , 1 5 x p i c r u r e
frames plus cross-l ines for
frami no and focus
1 2 . 5 m m
8 . 0
1 0 x
2 5 m m
1 4 . 0
1 2 . O
For measurement
w i t h t h e g r a d u a t i o n o f 1 0 / 1 0 0 m m
F o r m e a s u r e m e n t . V e r n i e r t y p e
s c a l e e n a b l e s d i r e c t r e a d i n g .
M i n i m u m
0 . 0 1 m m
T h e f i e l d n u m b e r i n d i c a t e s t h e e f f e c t i v e v i s u a l f i e l d o { v i e w f o r a p a r t i c u l a r e y e p i e c e , w h i c h , d i v i d e d
b y t h e p o w e r o f t h e o b i e c t i v e u s e d , g i v e s t h e d i a m e t e r o f t h e o b i e c t c o v e r e d i n m m ( r e a l f i e l d ) .
A l l e y e p i e c e s a r e p a r f o c a l w i t h i n t h e f i n e f o c u s i n g r a n g e .
H i g h e y e p o i n t e y e p i e c e s e n a b l e e a s i e r o b s e r v a t i o n , e s p e c i a l l y f o r s p e c t a c l e w e a r e r s
(3) Combinations of Objectives and Eyepieces
T o t a l m a g n i f y i n g p o w e r o b t a i n e d b y t h e c o m b i n a t i o n i s t h e p r o d u c t o f i n d i v i d u a l
o b j e c t i v e p o w e r m u l t i p l i e d b y i n d i v i d u a l e y e p i e c e p o w e r . A s e l e c t i o n o f t h e c o m b i n a t i o n
can be made so as to get the highest resolution of the image (resolving power), the largest
e x t e n t o f o b j e c t a r e a ( r e a l f i e l d ) w h i c h c a n b e o b s e r v e d w i t h o u t m o v i n g t h e s t a g e o r s l i d e ,
o r t h e g r e a t e s t t h i c k n e s s o f o b j e c t ( d e p t h o f f o c u s ) w h i c h c a n b e d i s t i n c t l y s e e n w i t h o u t
r a i s i n g o r l o w e r i n g t h e m i c r o s c o p e s t a g e , d e p e n d i n g u p o n t h e p u r p o s e o f t h e m i c r o s c o p e .
S h o w n b e l o w a r e t h e r e s u l t s c o m p i l e d f r o m t h e d i f f e r e n t c o m b i n a t i o n s o f o b i e c t i v e s a n d
eyep reces:
Table 7
Obiective
Eyepiece
Total
Magnifying
Power
Working
Distance
( m m )
Resolt
M i n i m u r
rtron or
r Resolved
Real Field of Viil
( m m l
Depth ot
Focus
( p m )
Huygenian
Eyepiece
I n oblecl
( p m l
I n image
( m m )
eyepoint
Eyepiece
4 X
5X
10x
15X
20x
40x
60x
9.5
2.7 -5.5
0 . 0 5 - 0 . 1 1
5 . 2 5
o . 1 1 - O . 2 2
4 . 5
0 . 1 6 - 0 . 3 2
3 . 5
5 . 2 5
1 0 0
3
6
4
2
5
2
10x
5X
10x
1 5 X
50x
100x
150X
t . t
t . t - z - z
0 . 0 5 - 0 . 1 1
2 . 1
o . 1 1 - O . 2 2
1 . 8
0 . 1 7 - 0 . 3 3
1 . 4
0 . 8
t o
1 0
8
20x
5X
10x
15X
100x
200x
300x
5 . 7
0 . 6 9 - 1 . 3 8
o . o 7 - o . 1 4
o . 1 4 - O . 2 4
o . 2 1 - O . 4 2
1 . 0 6
0 . 9
o . 7
1 . 0 6
0 . 6
o . 4
6
4
3
40x
5 X
200x
10x
400x
15X
r
6O0X
0.54
0.42-0.84
0 . 0 8 - 0 . 1 7
0 . 1 7 - 0 . 3 4
0 . 2 5 - 0 . 5 0
o.52
6 n F
0 . 3 5
o.52
0.30
o.20
1 . 8
1 . 2
i . 0
100x
10x
15X
1000x
1500x
0 . 1 6
0 . 2 2 - O . 4 4
o . 2 2 - O . 4 4
0 . 1 8
0 . 3 3 - 0 . 6 6
Q . 1 4
o . 1 2
0 . 4 4
0 . 0 8
I
0 . 3 8
23
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