It was the first high quality zoom designed for professional motion picture photography that incorporated a totally new design concept that has remained the basis for all cooke zoom lenses subsequently produced. Introduction to lens design by jose sasian september 2019. It was superseded by later designs in highend cameras, but is still widely used in inexpensive cameras, including variations using aspheric elements, particularly in cellphone cameras. A while ago i took the lens apart and i recognised the lens design as a cooke triplet. Genetic algorithm in structural design of cooke triplet lenses. Modern lens design mcgrawhill professional engineering kindle edition by smith, warren j download it once and read it on your kindle device, pc, phones or tablets. Introduction to lens design by jose sasian nook book ebook. Basically i was wondering if i could design a cooke triplet in a reasonable large format focal length using lenses you can buy out of a catalog. The cooke triplet is a system of three lenses designed in the 19th century to reduce distortion.
Cooke triplet news newspapers books scholar jstor january 2020 learn how and when to remove this template message. The cooke triplet is used for camera lenses with very wide fields, and is fantastic for that. Our design was based upon keeping the tot al optical path length for the axial. The process of designing lenses is both an art and a science. Dennis taylor invented this in 1893, using the advances of seidels theory. Pdf ab initio design of a cooke triplet usually necessitates a heuristic preselection of optical glasses for the three lens elements. He deals with lens design software, primarily oslo, by far the current market leaders, and. Making a telescope with a 5 cooke triplet cloudy nights. These three books are also highly recommended for their discussions of many other top. Key lens parameters and the operation spectral band for the geznsege and sigesi airspaced triplet lens designs are tabulated in table 1. It possesses just enough effective degrees selection from modern lens design, 2nd edition book. Kinglsake and included in his book lens design fundamentals, pp286295, acadmeic press 1978, isbn 0124086501. Techspec hastings triplet achromatic lenses feature a unique, threeelement design that provides for distortion free, colorcorrect viewing.
Field curvature for a cooke triplet and single lens focusing rays 60mm behind last surface. We propose to tackle the complex problem of design of a cooke triplet lens with prespecified aberration targets by reducing it to relatively simpler problems of design of individual components with required amounts of primary spherical aberration, central coma and longitudinal chromatic aberration. Ive designed them from scratch, without using a computer, or even a calculator. A diy 177mm f8 cooke triplet for 4x5 from offthe shelf. The cooke triplet is the first and simplest design form that is capable of correcting all the first and thirdorder aberrations over a medium fieldofview 1. Optical lenses have many important applications, from telescopes and spectacles, to microscopes and lasers. Explanation of triplets from fundamental optical design spie. The 2d layout for the sigesi triplet lens is similar to the design shown in fig. In 1950 a specific triplet was invented and patented by eastman kodak ef100mm, f1. In 1962, hopkins published a systematic study of a region of triplet solutions in the midst of the infinite number of thirdorder solutions.
The former has the advantage of higher optical throughput due to fewer airglass interfaces, but the latter provides greater flexibility in aberration control, as the internal surfaces are not. The tessar, heliar, and other compounded triplets ch. Cooke optics about us history cinematography lenses. The only later basic efforts made in lens history were the correction for three colors apochromatic lens, the coating against flares, and the massproduction of aspherical lenses. Modern lens design mcgrawhill professional engineering. I was recently given a 5 cooke triplet lens and its mount. The custom triplet lenses that we supply include the following range. The job of an optical lens designer is to design the lens system, either by designing a lens or multiple lenses into a system. Using only three elements, a negative flint glass element in the centre with a crown glass element on each side, the cooke triplet was capable of correcting spherical aberration, coma, astigmatism, field curvature and. The cooke triplet is a photographic lens designed and patented patent number gb 22,607 in 1893 by dennis taylor who was employed as chief engineer by t. The desired focal length of the system is therefore the power is. Inspired by my lens design class homework 2, in this post i will walk through the procedure for designing a cooke triplet from scratch using firstorder thin lens calculations, then optimizing it with real thicknesses in zemax opticstudio. At the time, the cooke triplet was a major advancement in lens design. Introduction the wellknown cooke triplet design, shown in fig.
The basic lens design forms are in here, and we can take a deep look into the development of lens design. Designing with offtheshelf lenses chapter 15 introduction to. The first is a comparison of the 3rd order aberrations with our spreadsheet, and the second is a comparison with zemax. The design is elegant, highlyconvergent using cyclicdescent optimization, which can. Delving deep into the mechanics of lens design, optics legend warren j. Sinar norma 4x5, 165mm cooke triplet lens, fomapan 100. The two elements on the outside are positive crowns and the middle element is a negative flint.
Modern achromats vs older cooke triplet refractors. Dec 20, 2018 the cooke triplet is used for camera lenses with very wide fields, and is fantastic for that. Yesterday was kind of slow at work, so i played in zemax while i worked on some other stuff. The tutorial shows stepbystep how to download free optical software, osloedu, and use it to analyse the optical performance of a concave. Brian blandford 2005 7 opic lens design tutorial edu plotting a spot diagram now create a map of the pattern of rays falling on the image. We will create a script that can generate any type of thick lens, including how to solve the lensmakers equation.
Feb 27, 2017 inspired by my lens design class homework 2, in this post i will walk through the procedure for designing a cooke triplet from scratch using firstorder thin lens calculations, then optimizing it with real thicknesses in zemax opticstudio. The sigesi triplet lens design can be used for the mwir and lwir spectral bands, whereas the geznsege triplet lens can be used only for the lwir spectral band. The cooke triplet was the first lens which was quite well color corrected for two colors achromatic lens and also corrected against astigmatism, patented in 1893 by dennis cooke. Using only three elements, a negative flint glass element in the centre with a crown glass element on each side, the cooke triplet was capable of correcting spherical aberration, coma, astigmatism, field curvature. D has been partially turned note flange for mounting against lens board. The simplest design that is capable of correcting all of the seven seidel aberrations over a wide field of view is the cooke triplet. Smith was chief scientist at kaiser electrooptics and was one of the most widely known writers and educators in optical design. These lenses are computer designed to interact with each other, contributing to the reduction or elimination of pincushion distortion and chromatic and spherical aberrations.
It was the first lens system that allowed elimination of most of the optical distortion or aberration at the outer edge of lenses. We present a versatile threelens optical design to improve the overall. Does anyone know anything about this type of lens and how i can make a telescope out of it. Finally, rudolph came up with a novel technique to correct for the chromatic. However, for the thin lens design of a cooke triplet composed of three airspaced singlets, the two steps of optimization mentioned above may be combined into a single optimization procedure. More cutaway crosssection of early cooke lens of cooke triplet design offering critically fine definition right up to the margins of the photographic plates. But the not all the lens designs are simple lenses, we will look at newer and important lens design forms as well. It was developed by harold dennis taylor in 1894 he worked for a company in york, england. While primarily a bible for the lens designer, practical computeraided lens design by gregory hallock smith serves also as a handbook for the optical systems engineer and as a source of historical and useful information for the technically minded photographer and astronomer. The computer program oslo was used to design the work, but the writeups are programneutral. Or a triplet may be designed with three spaced glasses, e. The triplet, an embarrassment of riches, 1988 slideshare.
It is rare to find such widespread utility in a single technical book. X exclude words from your search put in front of a word you want to leave out. Making a telescope with a 5 cooke triplet posted in atm, optics and diy forum. A triplet lens is a compound lens consisting of three single lenses. Smith reveals timetested methods for designing topquality lenses. We think this ct design will be a significant advantage for novel. The exact prescription of the lens that we will use the surface curvatures, glasses and thicknesses is an adaptation of a design done by r.
Initially these were also a triplet design and were perfectly usable at quite large apertures one of the few applications of the triplet design to a wide angle lens. The only later basic efforts made in lens history were the correction for three colors apochromatic lens, the coating against flares, and the massproduction of. Lens thickness limitation 9 8 variables glass choice and lens thickness is fixed, infinity object 9 lens thickness. List the lens data in the text window by clicking on len in the text window header. Cooke triplet a new design enough variables to correct all third order aberrations thought of as an afocal front and an imaging rear 1896 harold dennis taylor. Explanation of triplets from fundamental optical design. The total length of the geznsege triplet lens is shorter than the sigesi triplet lens by 47. The cooke triplet is a photographic lens designed and patented patent number gb 22,607 in. The cooke triplet concept was a simple and elegant solution to design issues that plagued lens designers of the era. Field guide to lens design 2012 bentley publications. The airspaced triplet is sometimes referred to as a cooke triplet. Use features like bookmarks, note taking and highlighting while reading modern lens design mcgrawhill professional engineering.
It covers the fundamental, optical theory, and the practical methods and tools employed in lens design. Triplet lenses take many forms, but the lens that is immediately thought of is the cooke triplet. He was the author of modern optical engineering, modern lens design, and practical optical system layout and use of stock lenses. The design, inspired by the cooketriplet configuration, allows for continuous beam. Therefore, this book can be used with any lens design software. Oct 22, 2004 unlike the first edition, which was more a collection of lens designs for use in larger projects, the 2nd edition of modern lens design is an optical howto. This concise, introductory book provides an overview of the subtle art of lens design. Pdf genetic algorithm in structural design of cooke triplet. In actuality, a mechanical engineer or mechanical designer can also design a lens system with the knowledge of paraxial lens design. It covers the fundamental, optical theory, and the practical methods and tools employed in lens design, in a succinct and accessible manner. A diy 177mm f8 cooke triplet for 4x5 from offthe shelf lenses that you can build recently acquired a minimill and minilathe, and started turning a barrel for this project. There are enough degrees of freedom to design an anastigmat lens. Design of a cooke triplet projects optics mechanical.
The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all seidel aberrations. This lens is, usually, achromatic and is considered to be a primitive design, which means, for example, most camera lenses evolved from it. I figured some intrepid diyer might be interested in the results and maybe put one together. It is often said that the optical design of the lens is less than half of the lens designers work in completing a project. Unlike the first edition, which was more a collection of lens designs for use in larger projects, the 2nd edition of modern lens design is an optical howto. In such lenses, like the cooke triplet, the ratio of the petzval radius to the focal. This study presents a new method for designing algorithm for a triplet lens with one or two elements that are made of a gradient index medium grin. Then each of the lenses in the cooke triplet is divided into two plano lenses, either planoconcave andor planoconvex. These are monochromatic designs and use lens thicknes. The ultimate guide to lens design using the classic. The three lenses may be cemented together, as in the steinheil triplet or the hastings triplet. This method is based upon considering a wellknown designed triplet lens cooke triplet lens as a target lens for designing of the hybrid triplet lens htl. This is an ultimate guide of lens design forms, the optical systems that are used in our world.
I want to make two comparisons of our lens design with the classic taylor triplet from 1893 gb 22,607. The cooke triplet consists of three separated lenses positioned at the finite distance. Our design was based upon keeping the total optical path length for the axial ray fixed. Lenses like the cooke triplet are typically designed for film cameras. Practical computeraided lens design by gregory hallock smith. The design is elegant, highlyconvergent using cyclicdescent optimization, which can be done iteratively, by hand and very robust.
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