1 Optics for Astrometry: a quick introduction William F. van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005

2 Filters and windows -1

3 Filters and windows - 2

4 Filters and focal length

5

6 Filter flatness

7

8 The Seidel Aberrations

9 First-order theory

10 S1 - Spherical aberration

11 S1 and lens shape

12 S1 and the caustic curve

13 S1 and the HST

14 S1 and astrometry

15 S2 - Coma

16 S2 - zonal variation

17 S2 - minimizing coma

18 S2 and astrometry

19 S3 - Astigmatism

20 S3 and image shape

21 S3 and astrometry

22 S4 - Field Curvature

23 S5 - OFAD

24 S5 and field stops

25 S6 - Chromatic aberration

26 Reflecting telescopes

27 Conic sections

28 Aberrations in reflectors

29 The sagittal depth

30 Spherical aberration

31 Higher-order aberrations - 1

32 Higher-order aberrations -2

33 Two-mirror telescopes

34 Normalized parameters

35 Reflector types

36 Angular aberrations

37 Classical Cass & the R-C

38 Optical alignment errors

39 Tilt and Decenter

40 Despace

41 Alignment error example

42 Relative aberrations

43 “Sky errors”

44 Useful relations

45 Tangent point location

46 Astrometric correction formulae