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▪ CONTENTS
APPENDIX
1
2 3
4: Telescope eyepiece specifications
D=diameter f=f.l./D K=conic R=surface
radius S=separation M=medium A=air
RI=best
image curvature A4/A6=aspheric
coefficients T=tilt (deg.)
TELESCOPE_EYEPIECES |
f(mm) |
FD* |
R1** |
S1
|
M1
|
R2
|
S2
|
M2 |
R3
|
S3 |
M3 |
R4 |
S4 |
M4 |
R5
|
S5 |
M5 |
R6
|
S6 |
M6 |
RI |
1.
Huygens
|
20 |
-5.8 |
18 |
3 |
BK7 |
0
|
20 |
A |
9 |
2 |
BK7 |
0 |
3.1 |
A |
- |
- |
- |
- |
- |
- |
18 |
2.
Ramsden
|
20 |
4 |
0 |
4 |
BK7 |
-14
|
18 |
A |
14 |
2.5 |
BK7 |
0 |
8 |
A |
- |
- |
- |
- |
- |
- |
60 |
3.
Monocentric
|
20 |
8.3 |
11.6 |
6.3 |
F2 |
5.3 |
10.6 |
BK7 |
-5.3
|
6.3
|
F2 |
-11.6 |
9 |
A |
- |
- |
- |
- |
- |
- |
18 |
4.
Kellner
|
20 |
5.8 |
0 |
3.8 |
BAK2 |
-17 |
16 |
A |
14 |
6 |
BAK2 |
-10 |
1.4 |
F4 |
0 |
9.5 |
A |
- |
- |
- |
100
|
5.
König
|
astigmatic |
20 |
12.9 |
-31.9 |
1.5 |
SF4 |
15.2 |
6.1 |
SK10 |
-18.2 |
0.1 |
A |
20.5
|
3.8 |
SK2 |
64.6
|
21.3 |
A
|
-
|
- |
- |
230 |
comatic |
20 |
12.9 |
-42.5 |
1.9 |
SF4 |
15.8 |
5 |
SK10 |
-19.3 |
0.13 |
A |
20.8 |
6 |
SK2 |
86.6 |
7.6 |
A |
- |
- |
- |
-36 |
6.
Erfle
|
20 |
11.6 |
-55 |
1.7 |
SF12 |
22.6 |
6.6 |
PSK3 |
-30 |
0.1 |
A |
41
|
6.6 |
FK5 |
-41 |
0.1 |
A |
19 |
6.6 |
PSK3 |
|
R7
/S7
/M7 - R8
/S8
/M8⇒
-29/1.7/SF10
- 166/ 15/A |
100 |
7.
Abbe
|
20 |
11.2 |
26.7 |
7.1 |
BAF5 |
-16
|
1.8 |
SF14 |
16 |
7.1 |
SK7 |
-24.9 |
0.1 |
A |
26.7 |
4.45 |
SF10 |
0 |
16.4 |
A |
60 |
8.
Plössl
|
20 |
14.3 |
0 |
1.8 |
SF19 |
18.4 |
7.4 |
SK11 |
-19.3 |
0.1 |
A |
19.3 |
6.4 |
SK11 |
-18.4 |
1.8 |
SF19 |
0 |
15.6 |
A |
70 |
9.
Achromat pair
|
20 |
14.7 |
0 |
2 |
F4 |
19 |
6 |
BaK2 |
-19 |
0.1 |
A |
19 |
6 |
BaK2 |
-19 |
2 |
F4 |
0 |
18 |
A |
∞ |
10.
Single lens
pair
|
20 |
20.2 |
0 |
3 |
BK7 |
-21 |
0.1 |
A |
21 |
3 |
BK7 |
0 |
20 |
A |
|
|
|
|
|
- |
24
|
*Front
distance: field lens front surface to objective's image
separation (last separation S is the eye relief)
**Front
field lens radius |
Human Eye: Optical
model |
Dmm |
f/ |
R1 |
S1 |
M1 |
R2 |
S2
|
M2 |
R3 |
S3 |
M3 |
R4 |
S4 |
M4 |
R5
|
S5 |
M5 |
R6
|
S6 |
M6 |
RI |
|
1-7 |
20-3 |
7.3
|
0.45
|
Silica |
5.6 |
2.8 |
Water |
0* |
0
|
Water |
500** |
0.6 |
Pyrex |
2.6 |
4 |
Silica |
-6.3 |
~20 |
Water |
-12.5 |
*aperture
stop
**cylinder |
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