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Topic: Cooke Triplet

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Angenieux retrofocus

Aberration in optical systems

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	Cooke Triplet (Site not responding. Last check: 2007-10-22)
		The Cooke triplet is a photographic lens design designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by Cooke of York.
		A Cooke triplet comprises a negative flint glass element in the centre with a crown glass element on each side.
		Despite the fact that the Cooke design was patented in 1893 it seems that the use of achromatic triplet designs in astronomy appeared as early as 1765.
	www.factsite.co.uk /en/wikipedia/c/co/cooke_triplet.html (186 words)

	f32 Large Format Equipment - Lenses - Cooke Lenses
		The Cooke Triplet, patented by H. Dennis Taylor in England in 1893, was a simple and elegant solution to the problem of what was then called "a streakiness of definition" that appeared in photos, especially at their margins.
		The first lenses made using the Cooke Triplet construction consisted of three uncemented elements with adjustable air spaces, controlled by a tiny screw in the center of the lens barrel that could be used for a final adjustment before leaving Leicester for market.
		Cooke Primoplane lenses were sold mounted to between-lens shutters with the complete lens fitted in the front of the shutter to allow the photographer to take full advantage of the extreme rise of the camera front.
	www.f32.net /Services/Equipment/Lenses/cooke.php (3945 words)

	Cooke Triplet (Site not responding. Last check: 2007-10-22)
		The Cooke triplet is a photographic lens design designed and patented in 1893 by DennisTaylor who was employed as chief engineer by Cooke of York.
		A Cooke triplet comprises a negative flint glass element in the centrewith a crown glass element on each side.
		Despite the fact that the Cooke design was patented in 1893 it seems that the use of achromatic triplet designs in astronomyappeared as early as 1765.
	www.therfcc.org /cooke-triplet-109715.html (184 words)

	Optimization of the Cooke triplet
		Optimization of the Cooke triplet with various evolution strategies and the damped least squares is presented.
		Cooke triplet is one of very popular objectives, which is used mainly for normal and narrow angle applications.
		Cooke triplet, one relatively simple optical system, is chosen to be starting point for optimization.
	diginaut.com /shareware/ados/documents/optimisation/optimisation.htm (3780 words)

	Cooke History: 1890s Cooke Triplet
		As optical manager of T. Cooke and Sons of York, makers of astronomical telescopes, H. Dennis Taylor attempted to eliminate the optical distortion or aberration at the outer edge of lenses.
		The Cooke Triplet concept was a simple and elegant solution to design issues that plagued lens designers of the era.
		Today, triplets of various kinds are used almost universally for lenses of intermediate aperture sold on smaller still cameras.
	www.cookeoptics.com /cooke.nsf/active/0EABFF909955D1E685256E8500295708 (383 words)

	Fixed-focus triplet projection lens for overhead projectors - Patent 5596455
		A Cooke triplet projection lens for use in overhead projectors comprises two outer positive elements of an ophthalmic crown glass and one inner negative element of a light flint glass.
		A Cooke triplet lens generally consists of three pieces of glass or polymers, called elements, housed in a mechanical structure which is called the barrel.
		It would, therefore, be desirable and advantageous to devise a construction of a Cooke triplet lens which is compact and relatively inexpensive, and yet which achieves superior performance in the noted characteristics, i.e., generally provides a sharper, true image.
	www.freepatentsonline.com /5596455.html (3797 words)

	Cooke-Clarke Telescope (Site not responding. Last check: 2007-10-22)
		The historic telescope seen on the left dates from 1913 and comprises a Cooke triplet lens in a mount made by Alvan Clarke and Sons.
		The Cooke triplet lens holder is the bronze portion mounted at the front end of the grey telescope tube.
		Because it is a historically significant instrument, we expect that the telescope would continue to be identified as the telescope that came from the Maria Mitchell Observatory, and that the history of the telescope be kept with it.
	www.aas.org /~pboyce/mma/cooke-tel.htm (844 words)

	Bill Cooke Imports (Site not responding. Last check: 2007-10-22)
		Cooke Triplet 2: is Taylor who was employed as chief engineer by Cooke of York.
		It was the first lens system that allo 4: loat: right; margin: 0 0 1em 1em;"> 6: A Cooke triplet comprises a negative flint glass elem 10: Despite the fact that the Cooke design was patented in 1893 it seems that the use
		Robin Cooke, Baron Cooke of Thorndon 1: '''Robin Brunskill Cooke, Baron Cooke of Thorndon''', Order of New ZealandONZ, O 3: Lord Cooke was educated at the Wanganui Collegiate School] 5: f this tribunal.
	www.daikaiju.com /edge/38640-bill%20cooke%20imports.html (600 words)

	Encyclopedia: Science of photography
		A photographic lens is composed of several lenses, to reduce the effects of Chromatic aberration, Coma, Spherical aberration, and to allow focusing, and possibly zooming capabilities.
		A simple example is the Cooke triplet, which was used in early cameras, but has since been replaced by more complex systems.
		Another, the Angenieux retrofocus allows the distance between the last lens and the film to be larger than it would be otherwise.
	www.nationmaster.com /encyclopedia/Science-of-photography (2556 words)

	Optical analysis systems - Patent 20050157385
		In addition, pairs of Cooke triplets used as objective and imaging lenses would be optically symmetrical.
		The low resolution imaging lens is a Hastings triplet having a 50 mm focal length and the low resolution objective lens is a Hastings triplet having a 85 mm focal length.
		The high resolution objective lens is a Hastings triplet having a focal length of 12 mm and the high resolution imaging lens is Hastings triplet having a focal length of 100 mm.
	www.freepatentsonline.com /20050157385.html (9076 words)

	Cooke Township, Pennsylvania - Encyclopedia Glossary Meaning Explanation Cooke Township, Pennsylvania (Site not responding. Last check: 2007-10-22)
		Cooke Township, Pennsylvania - Encyclopedia Glossary Meaning Explanation Cooke Township, Pennsylvania.
		Here you will find more informations about Cooke Township, Pennsylvania.
		Cooke Township is a township located in Cumberland County, Pennsylvania.
	www.encyclopedia-glossary.com /en/Cooke-Township-Pennsylvania.html (405 words)

	Info needed on Cooke Amotal 2 inch f/2 LTM
		Cooke was then owned by Taylor Hobson but the focusing mount is engraved "Made in Italy".
		A couple of years ago I was in contact with Barbara Lowry, at Cooke, in a hare- brained effort to persuade them to re-enter the 35mm stills market.
		At that time, Zeiss Ikon hadn't announced their line of M lenses and I thought that Cooke could come up with something fabulous along the lines of their series IV movie lenses but in a stills mount.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=00DjSA (1511 words)

	Lumenlab > New theories for keystone correction
		If you ignore the overall arrangement of the pixels for a second, the triplet's job, for each pixel, is to focus the 1" arc into a point in the general vicinity of the screen.
		Triplets are a special set up of lens designed to correct this aberation.
		While making a keystoning triplet would be easier then offset projection I think, as it wouldn't require a lens with a very large area of focus, it may or may not be possible to design a keystoning triplet that works for every projection size.
	www.lumenlab.com /forums/lofiversion/index.php/t4591-100.html (5413 words)

	Limited Press: American Cinematographer Journal - June 2000 (Site not responding. Last check: 2007-10-22)
		All were shot with the Cooke S4 series of prime lenses, which have won the hearts and minds of leading cinematographers worldwide since they were introduced two years ago.
		By the early 1990s, Cooke, the venerable British company that made some of the very first (and many of the most popular) motion-picture lenses, had been allowed to wither and almost die by its corporate parent, Rank Organization, PLC.
		According to Les Zellan, the New Jersey-based chairman of Cooke Optics, Ltd., Cooke lenses were born in Leicester, England in 1893, when Taylor, Taylor and Hobson purchased what Zellan calls the "revolutionary" Cooke Triplet lens design, patent and company name from T. Cooke and Sons, a telescope manufacturer.
	www.cookeoptics.com /cooke.nsf/press/acjjune200 (1240 words)

	Demotrip.len - A Cooke triplet (Site not responding. Last check: 2007-10-22)
		As a historical note, this lens was not designed using OSLO, but is rather an adaptation of a design done by R. Kingslake and included in his book "Lens Design Fundamentals", pp 286-295, (Academic Press 1978, ISBN 0-12-408650-1).
		As another historical note, this design form was actually invented by H. Dennis Taylor, who worked for Cooke.
		According to Kingslake, the lens was not manufactured by Cooke, but rather by Taylor-Hobson, another optical firm whose principals were not related to Taylor, despite the name.
	www.sinopt.com /software1/usrguide54/examples/demotrip.htm (166 words)

	Cooke Triplet - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-10-22)
		Cooke Triplet - Encyclopedia, History, Geography and Biography
		This page was last modified 14:03, 7 Feb 2005.
		This encyclopedia, history, geography and biography article about Cooke Triplet contains research on
	www.arikah.net /encyclopedia/Cooke_Triplet (330 words)

	Re: Cooke Lenses (TECH-3D digest 1460
		First a lens label by NAME as Cooke (or more often, Taylor Hobson Cooke, a renowned English firm) is not apt to be a Cooke Triplet at all, but could be.
		I have heard that the early ones before color Xerox copiers were not suitable for general photography as corrected for blue and UV the max sensitivity of the selenium plate.
		The famed Zeiss Sonnar copied exactly in the early Japanese f/1.5's is a Cooke triplet with each element multi- compound.
	www.pauck.de /archive/mailinglist/tech-3d/mhonarc/msg00328.html (520 words)

	f32 Large Format Photography Forum: Cooke triplet quality?
		The Cooke Triplet was the name on the 1893 patent by H.D. Taylor.
		The first Cooke photographic lens and then Series II through V lenses were designed by H.D. Taylor and made by Taylor, Taylor and Hobson (H.D. Taylor was not a relation.) I believe that all of those first 6 lenses were made of the Cooke Triplet design, meaning they each had 3 elements.
		Not to be confused with the Cooke Series XV Triple Convertible lens which allows you to use the combined lenses or the just the back alone or front alone for different focal lengths.
	www.f32.net /discus/messages/6/3525.html?1082392811 (393 words)

	Vintage Cameras(English)
		They said it was more sharp than Triplet anastigmat lens, which was in fashion in that age.
		The Triplet lens had more old in history, it was made by H.D.Taylor of Thomas Cooke & Son in 1893.
		It was famous as a Cooke Triplet lens.
	camera007.at.infoseek.co.jp /index_e.html (951 words)

	Agfa Record - Which is better, really? - 3 Element vs 4 Element Lenses
		Let's not forget that Taylor, Taylor, and Hobson, licensees of the original Cooke Triplet, produced many highly regarded versions of that basic lens.
		I think your examples show clearly that a triplet at a higher aperture can be quite sharp, especially under good, contrasty lighting (outdoor+sunlight, flash).
		If you have to shoot wide open, however, or can/must print large, or crop tightly, the differences in lenses start to show; the Anastar, in the plane of critical focus, is still razor sharp to the corners of 6x6 at 2400 ppi (even at f/4), which is definitely not the case with the Seagull.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=00BKFg&unified_p=1 (1587 words)

	[No title]
		Please observe that we now have spot diameters of the order of 46 mm while the distortion amounts to a maximum of 4 mm or twice as much as for the Cooke triplet according to table 7.
		On the other hand the entry pupil is 15 mm which corresponds to 2.25 times as large a surface area as for the Cooke triplet.
		The performance that has been indicated for the above lens should not be understood in terms of fully-corrected solutions but rather the intention is that the reader acquire a feeling for how great the faults are for the various lens systems.
	www.polytec-pi.fr /sitek/section12.htm (1500 words)

	Cooke Process lens VB series (Site not responding. Last check: 2007-10-22)
		The "mild magnifying effect" you mention is a function of the long focal length of the lens rather than any characteristic of the lens design.
		The Cooke catalogs I have refer to "Cooke Process Lenses" rather than Series Vb, but I suspect they are referring to the same lens.
		Your suggestions to contact Cooke Optics sounds promising although the writing and serial number are so eroded on the lens barrel.
	www.largeformatphotography.info /lfforum/topic/499673.html (725 words)

	History of the telescope
		Some historians claim that the triplet was introduced in 1765 by Peter, son of John Dollond.
		The Cooke Triplet was a significant improvement of the Dolland triplet of more than a century earlier.
		The Cooke triplet, seen at right, is made of three different types of glass.
	www.antiquetelescopes.org /history.html (2222 words)

	Re: Shimming a triplet - 3D camera
		In a Cooke triplet (I looked this up last night after I posted my earlier message), in very rough terms, the front and rear elements are about equal in power and the center element is about the same power as the sum of the other two but it's negative.
		The front element to the center element is about half the distance from the center element to the rear element.
		Let's say you had to move it 0.1 mm (triplets are _very_ sensitive).
	www.pauck.de /archive/mailinglist/tech-3d/mhonarc/msg00180.html (544 words)

	Contax Lens Design
		The design consisted of two symmetrical cemented triplets (6 elements in 2 groups) in which the two outer elements are positive, one of the inner elements was used to correct spherical aberration and the other used to flatten the field.
		Another was using a cemented triplet in the rear instead of a doublet.
		The sonnar negative triplet consisted of a high-index outside and a lower-index element between.
	www.panix.com /~zone/photo/czlens.htm (4970 words)

	APUG - Mystery ULF lens
		Someone recently was selling a similar lens on e-bay which they described as an Aviar, which as I recall was a Cooke design, but actually made by Taylor, Taylor and Hobson.
		In the beginning, H. Taylor, an employee of T. Cooke and Sons, a microscope manufacturer later called Cooke, Troughton, and Sims, designed the Cooke triplet.
		Cooke's licensed Taylor's design to Taylor, Taylor, and Hobson (no connection to H. D.), who subsequently produced many versions of it, many badged Cooke and Taylor, Taylor, and Hobson.
	www.apug.org /forums/printthread.php?t=13633 (1056 words)

	Rogues Gallery
		Two examples of a triplet (with a split field corrector) are given.
		When the triplet form is reintroduced, performance is, however, dramatically improved.
		A cemented doublet and a cemented triplet are placed into the divergent beam to refocus it just over 3/4 aperture behind the primary.
	users.rcn.com /rflrs/roguesgal.htm (2424 words)

	Zeiss Tessar - Wikipedia, the free encyclopedia
		The name Tessar derived from the Greek word tetra to indicate the typical four lenses scheme.
		The Tessar is an evolution of the Cooke triplet design in which the rear element is replaced by a cemented achromatic doublet.
		A Tessar comprises four elements in three groups, one positive crown glass element on the front, one negative flint glass element at the center and a negative flint glass element cemented with a positive crown glass element at the rear.
	en.wikipedia.org /wiki/Zeiss_Tessar (201 words)

	diyAudio Forums Archive - HIGH END DIY triplet projection lens
		Here is a picture of a computer optimized wide angle cooke triplet which should work with LCD of 17 inch wide screen format.
		I have compared it to a four element optimized glass tessar lens and the tessar is slightly better giving a 32 micron spot for the paraxial axis.
		For most application the slight improvement of the tessar over the cooke triplet does not justify the cost and added complexity.
	www.diyaudio.com /forums/showthread/t-27471.html (2002 words)

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