A Course in Lens Design by Chris Velzel

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 an easy manner. thought is restricted to a minimal, and used to help the sensible layout paintings. The e-book introduces geometrical optics, optical tools and aberrations. It supplies an outline of the method of lens layout and of the thoughts utilized in this technique. 1/2 its content material is dedicated to the layout of 16 sorts of lenses, defined intimately from starting to finish. This e-book isn't like such a lot different books on lens layout since it stresses the significance of the preliminary levels of the layout strategy: (paraxial) lay-out and (thin-lens) pre-design. The argument for this variation of accessory is that during those levels a lot info could be received in regards to the houses of the lens to be designed. this knowledge can be utilized in later levels of the layout. This makes A direction in Lens layout an invaluable self-study booklet and an appropriate foundation for an introductory path in lens layout. the math ordinarily used is university algebra, in a couple of sections calculus is utilized. The ebook might be utilized by scholars of engineering and technical physics and by means of engineers and scientists.

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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 an easy manner. thought is restricted to a minimal, and used to help the sensible layout paintings. The e-book introduces geometrical optics, optical tools and aberrations. It supplies an outline of the method of lens layout and of the thoughts utilized in this technique. 1/2 its content material is dedicated to the layout of 16 sorts of lenses, defined intimately from starting to finish. This e-book isn't like such a lot different books on lens layout since it stresses the significance of the preliminary levels of the layout strategy: (paraxial) lay-out and (thin-lens) pre-design. The argument for this variation of accessory is that during those levels a lot info could be received in regards to the houses of the lens to be designed. this knowledge can be utilized in later levels of the layout. This makes A direction in Lens layout an invaluable self-study booklet and an appropriate foundation for an introductory path in lens layout. the math ordinarily used is university algebra, in a couple of sections calculus is utilized. The ebook might be utilized by scholars of engineering and technical physics and by means of engineers and scientists.

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32 2 Optical Instruments (Paraxial Approximation) The ocular magnification is Moc ¼ 250 f oc , so that we find for the total magnification M ¼ Mob Moc ¼ 500 n sin u : U ð3Þ Because the smallest pupil diameter is U = 2, the maximum magnification is Mmax ¼ 250 n sin u ð4Þ when the eye pupil is the limiting diameter. When we make the exit pupil of the ocular narrower, we can take a somewhat higher value for M; but beware of diffraction (a Uoc of 1 mm gives a spot of 5 lm on the retina). Van Heel recommends to take the maximum magnification as 1,000 n sin u [3].

11 Ray diagram for meridional field curvature Fig. 12 Astigmatism, OM meridional (tangential) rays, OS sagittal rays, T tangential focal line, Sag sagittal focal line In many cases n0 ¼ 1 will be valid. In third order it is permitted to take the paraxial value az of sin u0 ; this introduces an error of higher order. See also the ray diagram in Fig. 11 and the perspective drawing in Fig. 12. In Fig. 12 the sagittal rays OS lie in the sagittal plane through the chief ray and perpendicular to the meridional plane.

32 2 Optical Instruments (Paraxial Approximation) The ocular magnification is Moc ¼ 250 f oc , so that we find for the total magnification M ¼ Mob Moc ¼ 500 n sin u : U ð3Þ Because the smallest pupil diameter is U = 2, the maximum magnification is Mmax ¼ 250 n sin u ð4Þ when the eye pupil is the limiting diameter. When we make the exit pupil of the ocular narrower, we can take a somewhat higher value for M; but beware of diffraction (a Uoc of 1 mm gives a spot of 5 lm on the retina). Van Heel recommends to take the maximum magnification as 1,000 n sin u [3].

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