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Download A Course in Lens Design by Chris Velzel PDF

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By Chris Velzel

A direction in Lens layout is an guide within the layout of image-forming optical platforms. It teaches how a passable layout could be bought in a simple method. idea is restricted to a minimal, and used to help the sensible layout paintings. The e-book introduces geometrical optics, optical tools and aberrations. It provides an outline of the method of lens layout and of the suggestions utilized in this technique. 1/2 its content material is dedicated to the layout of 16 varieties of lenses, defined intimately from starting to finish. This ebook isn't the same as such a lot different books on lens layout since it stresses the significance of the preliminary levels of the layout approach: (paraxial) lay-out and (thin-lens) pre-design. The argument for this modification of accessory is that during those levels a lot info will be received concerning the houses of the lens to be designed. this data can be utilized in later levels of the layout. This makes A path in Lens layout an invaluable self-study ebook and an appropriate foundation for an introductory path in lens layout. the math customarily used is university algebra, in a number of sections calculus is utilized. The e-book may be utilized by scholars of engineering and technical physics and by means of engineers and scientists.

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A 2 times smaller F-number gives a 2 times smaller exposure time. The depth of focus Dz is given by Dz ¼ ÆDy F#; where Dy is the acceptable unsharpness, for instance the smallest detail discussed above. With a diffraction limited lens the depth of focus is given by Æ4kðF#Þ2 . This is called the Rayleigh DOF and constitutes a minimum of Dz. The distance from lens to film plane s0 is given by the imaging equation 1 1 1 ¼ þ s0 s f where s is the object distance. With a height "h of the film plane, the field angle w is given by tan w ¼ "h=s0 .

7 Distortion 0 ÀE ¼ b5 VW ¼ b5 yr g03 r gives dg ¼ b5 g03 r ; dn0 ¼ 0: n0 u 0 ð3:14Þ The wavefront is tilted, compared to the reference, over an angle b5 g03 r . This aberration is called distortion (of 3d order). The wavefront error and aberration plots for distortion are equal in form to those for magnification error shown in Fig. 5. Summary (geometrical properties of aberrations) Aberration Wavefront error Proportional to dg0 dn0 Spherical Coma Field curvature Astigmatism Distortion q4 q2 yr g0r q2 g02 r y2r g02 r yr g03 r q3 cos u q2 g0r ð2 þ cos2uÞ qg02 r cosu qg02 r cosu g03 r q3 sin u q2 g0r sin2 u qg02 r sinu 0 0 The term b6 W2 does not contribute to the aberrations in the image plane.

22 1 Geometrical Optics Fig. 22 Entrance pupil and exit pupil Fig. 1 Telecentric Stop When the stop is in the focal plane, as shown in the figures, the size of either object or image, or both, is independent of the distance from the lens. We have three types of telecentricity: object telecentricity (Fig. 24a), image telecentricity (Fig. 24b), and doublesided telecentricity (Fig. 25). Defocusing will cause a blurring of the image, but the chief ray, at the centre of the point image, will land at the same position in the image plane.

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