Lens Design II. Lecture 8: Special correction features I Herbert Gross. Winter term

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1 Lens Design II Lecture 8: Special correction features I Herbert Gross Winter term

2 2 Preliminary Schedule Lens Design II Aberrations and optimization Repetition Structural modifications Zero operands, lens splitting, lens addition, lens removal, material selection Aspheres Correction with aspheres, Forbes approach, optimal location of aspheres, several aspheres Freeforms Freeform surfaces, general aspects, surface description, quality assessment, initial systems Field flattening Astigmatism and field curvature, thick meniscus, plus-minus pairs, field lenses Chromatical correction I Achromatization, axial versus transversal, glass selection rules, burried surfaces Chromatical correction II Secondary spectrum, apochromatic correction, aplanatic achromates, spherochromatism Special correction topics I Symmetry, wide field systems, stop position, vignetting Special correction topics II Telecentricity, monocentric systems, anamorphotic lenses, Scheimpflug systems Higher order aberrations High NA systems, broken achromates, induced aberrations Further topics Sensitivity, scan systems, eyepieces Mirror systems special aspects, double passes, catadioptric systems Zoom systems Mechanical compensation, optical compensation Diffractive elements Color correction, ray equivalent model, straylight, third order aberrations, manufacturing Realization aspects Tolerancing, adjustment

3 3 Contents 1. Symmetry 2. Camera lenses 3. Stop position 4. Vignetting

4 4 Photographic lens Incidence angles for chief and marginal ray Photographic lens Field dominant system Primary goal is to control and correct field related aberrations: coma, astigmatism, field curvature, lateral color chief ray 60 incidence angle marginal ray

5 5 Principle of Symmetry Perfect symmetrical system: magnification m = -1 Stop in centre of symmetry Symmetrical contributions of wave aberrations are doubled (spherical) Asymmetrical contributions of wave aberration vanishes W(-x) = -W(x) Easy correction of: coma, distortion, chromatical change of magnification front part rear part 2 1 3

6 6 Even Aberrations in Symmetrical Systems Aberrations with even symmetry are doubled Spherical aberration, Astigmatism, field curvature, axial chromatical aberration spherical aberration in an symmetrical system W c4 Z4 c9 Z9 W c4 Z4 c9 Z9 doubled values W 2c Z 2c Z Ref: M. Seesselberg

7 7 Odd Aberrations in Symmetrical Systems Aberrations with odd symmetry are vanishing Coma, distortion, transverse chromatical aberration coma in an symmetrical system W c8 Z8 c15 Z15 W c8 Z8 c15 Z15 vanishing values Ref: M. Seesselberg W 0

8 8 Symmetrical Dublet Variable focal length f = mm Invariant: object size y = 10 mm numerical aperture NA = 0.1 Type of system changes: - dominant spherical for large f - dominant field for small f Data: f = 200 mm f = 100 mm f = 50 mm f = 20 mm No focal length [mm] Length [mm] spherical c 9 field curvature c 4 astigmatism c f = 15 mm

9 9 Field vs Aperture Correction Remote pupil system with decreasing field for one wavelength and 4 lenses Aperture maximum value for overall diffraction limited correction Large field angles: lenses bended towards pupil Old achromate move towards usual achromate w [ ] D [mm]

10 10 Wide Angle Lenses - Symmetrical Radii of curvature of wide angle camera lenses - symmetrical setups Mostly radii 'concentric' towards the stop losition Locations z j of surfaces normalized for comparison Nearly linear trend, some exceptions near to the pupil Stop position centered R j Pleogon Double Gauss Biogon stop z j z j

11 11 Wide Angle Lenses - Asymmetrical Radii of curvature of wide angle camera lenses - asymmetrical setups No clear trend Locations z j of surfaces normalized for comparison Stop position in the rear part R j 300 Flektogon Fisheye Distagon stop z j

12 12 Coma Correction: Symmetry Principle Perfect coma correction in the case of symmetry But magnification m = -1 not useful in most practical cases Image height: y = 19 mm Symmetry principle Pupil section: meridional sagittal Transverse Aberration: y' 0.5 mm y' 0.5 mm (a) (b) From : H. Zügge

13 13 Wide Angle Camera systems Wide angle camera with f# = 2 and 120 FoV Different effort in lens design according to constraints 1. plane sensor, telecentric 2. plane sensor 3. curved sensor Ref.: I. Stamenov

14 14 Mono-Centric Systems Mono-centric systems: - perfect correction of odd aberrations coma, distortion, lateral color - in case of perfect mono-centric symmetry also astigmatism is corrected - for spherical curved image surfaces: only spherical aberration is remaining Mono-centric systems can be reflective, refractive or catadioptric Also for a non-centric ray path the correction can be extrem good In particular the combination of refractive with reflective surfaces can be a benefit Many setups ae of practicl importance: - Schmidt telescope - Offner system - retroreflectors - Schwarzschild mirror objective Nearly mono-centric are also easy to correct: wide angle camera lenses

15 Nearly Mono-Centric Lenses Metrogon Topogon Hypergon Hologon Pleogon Shafer NA = 0.95

16 Mono-Centric Lenses Schwarzschild Newton Stamenov Schmidt Stop M1 N-F2 N-BK7 focal plane (curved)

17 17 Mono-Centric Systems Offner Offner- Wynne Dyson r L n r M object image Sutton balllens r 1 n 2 r 2 mirror Retrofocus I n 3 n 1 r 3 Sasian Retrofocus II r sph max r m

18 18 Coma Correction: Stop Position and Aspheres Combined effect, aspherical case prevent correction Plano-convex element exhibits spherical aberration Sagittal coma y' 0.5 mm Spherical aberration corrected with aspheric surface aspheric Sagittal coma y' 0.5 mm aspheric aspheric Ref : H. Zügge

19 19 Influence of Stop Position on Performance Ray path of chief ray depends on stop position stop positions spot

20 20 Effect of Stop Position Example photographic lens stop Small axial shift of stop changes tranverse aberrations In particular coma is strongly influenced Ref: H.Zügge

21 21 Aberrations Limited by Vignetting Clipping of outer coma rays by vignetting Consequences: - reduced brightness - anisotropic resolution without vignettierung with vignettierung tangential / sagittal Ref: H.Zügge

22 22 Vignetting Double Gauss Lens 1.4 / 50 Improved performance Reduced uniformity of brightness a) no vignetting:weight 251 g relative illumination b) vignetted: weight 90 g 81 % F# 2.8 Ref.: H. Zügge

23 23 Vignetting of Camera Lenses Blocked light in front and rear part of a camera lens due to vignetting from front side from rear side Ref.: V. Blahnik

24 Classification Extrem Wide Angle Fish Eye Quasi-Symmetrical Angle Topogon Metrogon Special Telecentric I Families of photographic lenses Long history Not unique Panoramic Lens Pleon Wide Angle Retrofocus Retrofocus SLR Super-Angulon Pleogon Hypergon Hologon Telephoto Plastic Aspheric I Telecentric II Compact Catadioptric Plastic Aspheric II Flektogon Distagon Biogon IR Camera Lens UV Lens Triplets Retrofocus II Vivitar Triplet Pentac Ernostar Less Symmetrical Ernostar II Landscape Singlets Achromatic Landscape Heliar Hektor Inverse Triplet Sonnar Double Gauss Biotar / Planar Quadruplets Ultran Petzval, Portrait Petzval Petzval,Portrait flat Petzval Projection R-Biotar Symmetrical Doublets Dagor Dagor reversed Rapid Rectilinear Aplanat Periskop Double Gauss II Noctilux Quasi-Symmetrical Doublets Tessar Protar Orthostigmatic Plasmat Kino-Plasmat Celor Unar Antiplanet Angulon

25 25 Symmetry Principle Application of symmetry principle: photographic lenses Especially field dominant aberrations can be corrected Also approximate fulfillment of symmetry condition helps Triplet significantly: quasi symmetry Realization of quasisymmetric setups in nearly all photographic systems Double Gauss (6 elements) Biogon Double Gauss (7 elements) Ref : H. Zügge

26 Photographic Lenses Tessar Distagon Double Gauss Tele system Super Angulon Wide angle Fish-eye

27 Retrofocus Lenses Example lens 2 Distagon

28 Special Designs Compact Camera Plastic Aspheric Lens Mobile Phone camera

29 Handy Phone Objective lenses Examples US L = 4.2 mm, F'=2.8, f = 3.67 mm, 2w=2x34 US L = 6.0 mm, F'=2.8, f = 4.0 mm, 2w=2x31 EP L = 5.37 mm, F'=2.88, f = 3.32 mm, 2w=2x33.9 Olympus 2 L = 7.5 mm, F'=2.8, f = 4.57 mm, 2w=2x33 Ref: T. Steinich

30 Fish-Eye-Lens Nikon 210 Pleon (air reconnaissance)

31 Wide-Angle Lenses Hypergon Strong vignetting 1.0 I(r) 0.5 Topogon Metrogon field 0 angle w

32 Wide-Angle Lenses Hologon Inverse Triplet Pleogon Biogon Super-Angulon

33 Retrofocus Lenses Flektogon Vivitar

34 Fish-Eye-Lens Example lens fisheye y -100% 0 100% a) nm 587 nm 656 nm tan sag ideal [mm -1 ] cyc/mm 20 cyc/mm 40 cyc/mm 60 cyc/mm b) c) solid: tan dashed: sag field angle 100

35 Fish-Eye-Lens Pupil variation: position and orientation pupil location s ExP [mm] 110 a y' ExP [mm] 150 b w [ ] w [ ]

36 Fish-Eye-Lens Distortion types y' [a.u.] 2 gnomonic stereographic 1.5 f- -projection orthographic y' [mm] 1 aperture related y' = f' tan(w) y' = f' w fisheye lens w [ ] 10 a b w [ ]

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