Eyepieces

In ATM, Book 3, Horace H. Selby presented several prescriptions for telescope eyepieces. Many of these prescriptions are replicated here as links to ZEMAX and OSLO files (.zmx and .len).

Each prescription is scaled to a focal length of 100 mm. This made for relatively error-free data entry (hopefully). As few changes as possible were made to the prescriptions, in order to keep the reference to the original work somewhat clean. A key exception to this is the actual working distance, which was set to a photopically optimized value.

For glass choices, I opined the Sumita catalog had the closest set of glasses to those in the Selby table. I restricted myself to that catalog, as it was available to both the ZEMAX and OSLO models. The actual icodes given in the original Selby table are provided in the System Notes in the prescription files.

Number

Name

Origin

Date

Field

C.Ap.

Min.f'

B.F.L.

W.Dist.

Ref.

ZEMAX

OSLO

1

Simple

Keppler

1610

10

f/35

4 in

0.9

0.9

ZEMAX

OSLO

2

simple

1612

7

f/25

4 in

1.0

0.9

ZEMAX

OSLO

3

simple

1612

10

f/40

4 in

0.9

1.0

ZEMAX

OSLO

4

simple

1620

10

f/20

4 in

0.95

0.9

ZEMAX

OSLO

5

Coddington

Coddington

15

f/20

1 in

0.6

0.6

ZEMAX

OSLO

6

Brewster

Brewster

12

f/20

1 in

0.6

0.6

ZEMAX

OSLO

7

Stanhope

Brewster

15

f/15

0.7 in

0.2

0.8

ZEMAX

OSLO

8

Solid

Tolles

20

f/8

0.3 in

-0.02

0.9

ZEMAX

OSLO

9

Spheric

Wollaston

f/30

3 in

10a

doublet

Wollaston

10

f/12

1.5 in

0.5

0.5

ZEMAX

OSLO

14

achromat

Steinheil

20

f/5

0.2 in

0.9

0.9

ZEMAX

OSLO

16

Huygens

Huygens

1700

40

f/8

0.8 in

0.3

-0.6

ZEMAX

OSLO

18

Airy

Airy

1800

45

f/7

0.5 in

ZEMAX

OSLO

19

Ramsden

Ramsden

1780

35

f/7

0.4 in

0

0

ZEMAX

OSLO

20a

Ramsden

Airy

1800

30

f/7

0.5 in

0.4

0.3

20b

Ramsden

Airy

1800

30

f/7

0.5 in

0.4

0.3

ZEMAX

OSLO

21a

Kellner

Kellner

1850

45

f/6

0.3 in

0.3

ZEMAX

OSLO

21b

Kellner

Kellner

1850

45

f/6

0.3 in

0.3

ZEMAX

OSLO

21c

Kellner

Kellner

1850

45

f/6

0.3 in

0.3

22

Achromatic Ramsden

35

f/6

0.3 in

0.4

0.4

ZEMAX

OSLO

23

Achromatic

Hastings

30

f/7

0.6 in

0.45

0.25

ZEMAX

OSLO

25

solid

Hastings

25

f/8

0.3 in

27

triplet

Hastings

30

f/6

0.2 in

0.8

0.8

ZEMAX

OSLO

28

triplet

35

f/10

0.4 in

0.8

0.8

ZEMAX

OSLO

29

monocentric

Steinheil

20

f/10

0.6

0.5

ZEMAX

OSLO

33a

Erfle

Erfle

65

f/5

0.3 in

0.38

0.24

B.P. 145503

ZEMAX

OSLO

33b

Erfle

Erfle

65

f/5

0.3 in

0.38

0.24

B.P. 145503

ZEMAX

OSLO

33c

Erfle

Erfle

65

f/5

0.3 in

0.38

0.24

B.P. 145503

ZEMAX

OSLO

34

Mod. Erfle

Kaspereit

65

f/6

0.3 in

0.3

0.3

ZEMAX

38

Kellner

Koenig

45

0.32

0.35

D.R.P. 188200

ZEMAX

OSLO

42

symmetric

Steinheil

35

f/6

0.2 in

0.77

0.68

ZEMAX

OSLO

Number

Name

Origin

Date

Field

C.Ap.

Min.f'

B.F.L.

W.Dist.

Ref.

ZEMAX

OSLO

UP