DE685572C - Photographic lens - Google Patents

Photographic lens

Info

Publication number
DE685572C
DE685572C DEL90958D DEL0090958D DE685572C DE 685572 C DE685572 C DE 685572C DE L90958 D DEL90958 D DE L90958D DE L0090958 D DEL0090958 D DE L0090958D DE 685572 C DE685572 C DE 685572C
Authority
DE
Germany
Prior art keywords
focal length
link
lens
calculated
absolute terms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEL90958D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ernst Leitz Wetzlar GmbH filed Critical Ernst Leitz Wetzlar GmbH
Priority to DEL90958D priority Critical patent/DE685572C/en
Application granted granted Critical
Publication of DE685572C publication Critical patent/DE685572C/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Description

Photographisches Objektiv Die Erfindung geht aus von einem lichtstarken, unsymmetrischen Objektiv, bestehend aus zwei sammelnden Außengliedern und zwei von letzteren eingeschlossenen, meniskenförmig ausgebildeten Gliedern, von denen das erste Systemglied eine stark zerstreuende Kittfläche aufweist und die Brennweite des dritten Gliedes, absolut gerechnet, mindestens zehnmal so groß wie die Gesamtbrennweite des Objektivs ist.Photographic lens The invention is based on a bright, asymmetrical lens consisting of two collecting outer links and two of the latter enclosed, meniscus-shaped limbs, of which the first system member has a strongly dispersing cement surface and the focal length of the third link, calculated in absolute terms, at least ten times as large as the total focal length of the lens is.

Um die bei solchen Objektiven störende Überkorrektion der sphärischen Längsaberration in den meridionalen Strahlenbüscheln für ein relativ großes Bildfeld auf ein unmerkliches Maß zu verringern oder ganz zu beseitigen, ist erfindungsgemäß die Brennweite des dritten Gliedes, absolut gerechnet, zugleich mindestens zehnmal so groß, sowohl wie die Brennweite des ersten Gliedes als auch wie die Brennweite des vierten Gliedes. Die Brennweite des dritten Gliedes kann dabei, wie bekannt, negativ, aber auch abweichend davon positiv gewählt werden. Etwaige Kittflächen im zweiten bis vierten Glied dürfen keine stark zerstreuende Wirkung haben wie die im ersten Glied; sie müssen vielmehr entweder schwach zerstreuend, neutral oder von sammelnder Wirkung sein.To avoid the overcorrection of the spherical Longitudinal aberration in the meridional bundles of rays for a relatively large field of view To reduce it to an imperceptible level or to eliminate it entirely is according to the invention the focal length of the third link, calculated in absolute terms, at least ten times at the same time as great as both the focal length of the first link and the focal length of the fourth link. The focal length of the third link can, as is known, negative, but also deviating from this, positive. Any putty surfaces in the second to fourth members must not have a strongly dispersing effect like that in the first link; Rather, they must either be weakly dispersive, or neutral be of a collecting effect.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes schematisch dargestellt. Dieses Beispiel enthält im ersten Glied und nur in diesem eine stark zerstreuende Kittfläche. Die Brennweite des dritten Gliedes ist, absolut gerechnet, das 29fache der Brennweite des Gesamtobjektivs. Sie ist erfindungsgemäß aber auch, absolut gerechnet, rund 2omal so groß wie die Brennweite des ersten Gliedes und rund 25mal so groß wie die Brennweite des vierten Gliedes. Im zweiten Glied ist eine praktisch nur chromatisch wirkende und im dritten Glied eine mäßig sammelnde Kittfläche vorgesehen. Dem Beispiel sind noch die Seidelschen Teilkoeffizienten hinzugefügt. Zahlenbeispiel f = i ; Öffnungsverhältnis = i : 2; Bildwinkel etwa 50° Abstände Glasart r, _ -+- o,6886 o,=o8 1,5338/55,4 r2 = - z,2296 0,030 1,6727/32,2 y'3 = - 19,565 0,002 Luft r9 = + 03325 o,098 1,6700/47,2 _ @- 0,4623 0,030 1,6645/359 re = + 0,235= ==6 Blende Luft 0,09= 'r, = - 0,2823 0 0,030 1,5673/4',8 r$ _ -+- o,8853 0,=o8 =,6204/6o,3 7s = - 0,3787 0,002 Luft ru = - =9565 e049 1,6074/56.7 r11 = - o6709 Seidelsche- Teilkoeffizienten Fläche A B , P I d o,6949 -i-- 0<+0,3295 +0,5054 I +0,5749 2 - 03272 -I- o:-0,0713 -0,0440 +0,0338 3 +0,2412 -0, 32zi.,-. + 0,43T3 -I- o,o2o6 -o,604= 4 +0,9239 -f 0,56o9 +0,3405 -I-- T,2066 -L- 0,9392 5 +0,0001 +0,0007 +0,0038 -0,0O43 -0,0027 6 - 2,2i0= - =,6o47 -1,=65I - 1,6981 -2,o789 7 -3,8327 -o,2889 -0,0218 -i,2822 - 0,o983 8 + 0,o845 + 0,i269 +0,1905 +0,0236 I -1- 0,3216 9 +2,3940 +0,4958 +0,1027 + 1,0110 +0,2307 =o -0,0339 + 0,o825 -0,2008 --0,0193 +0,5356 =i + 2,3ßio -f- o.4577 i + o,o88o --0 ,5632 + 0,i252 i Summe +0,3157 I + 0,T395 +0,0273 j T 0,2825 -0,0030 An exemplary embodiment of the subject matter of the invention is shown schematically in the drawing. This example contains a strongly dispersing cement surface in the first link and only in this one. The focal length of the third element is, in absolute terms, 29 times the focal length of the entire lens. According to the invention, however, calculated in absolute terms, it is also around 20 times as large as the focal length of the first member and around 25 times as large as the focal length of the fourth member. In the second section there is a practically only chromatic effect and in the third section there is a moderately collecting cement surface. The Seidel partial coefficients have also been added to the example. Numerical example f = i; Aperture ratio = i: 2; Angle of view about 50 ° Distances type of glass r, _ - + - o, 6886 o, = o8 1.5338 / 55.4 r2 = - z, 2296 0 0 3 0 1.6727 / 32.2 y'3 = - 19.565 0.002 air r9 = + 03325 o, 098 1.6700 / 47.2 _ @ - 0.4623 0.030 1.6645 / 359 re = + 0.235 = == 6 aperture air 0.09 = 'r, = - 0.2823 0 0.030 1.5673 / 4 ', 8 r $ _ - + - o, 8853 0, = o8 =, 6204 / 6o, 3 7s = - 0.3787 0.002 air ru = - = 9565 e049 1.6074 / 56.7 r11 = - o6709 Seidel partial coefficients Area AB, PI d o.6949 -i-- 0 < +0.3295 +0.5054 I +0.5749 2 - 03272 -I- o: -0.0713 -0.0440 +0.0338 3 +0.2412 -0, 32zi. -. + 0.43T3 -I- o, o2o6 -o, 604 = 4 +0.9239 -f 0.56o9 +0.3405 -I-- T, 2066 -L- 0.9392 5 +0.0001 +0.0007 +0.0038 -0.0O43 -0.0027 6 - 2.2i0 = - =, 6o47 -1, = 65I - 1.6981 -2, o789 7 -3.8327 -o, 2889 -0.0218 -i, 2822-0, o983 8 + 0, o845 + 0, i269 +0.1905 +0.0236 I -1- 0.3216 9 +2.3940 +0.4958 +0.1027 + 1.0110 +0.2307 = o -0.0339 + 0, o825 -0.2008 --0.0193 +0.5356 = i + 2,3ßio -f- o.4577 i + o, o88o --0 , 5632 + 0, i25 2 i Total +0.3157 I + 0, T395 +0.0273 j T 0.2825 -0.0 0 30

Claims (4)

PATENTANSPRÜCHE.` i. Lichtstarkes, unsymmetrisches Objektiv, bestehend aus zwei sammelnden Außengliedern und zwei von letzteren eingeschlossenen, meniskenfdrmig ausgebildeten Gliedern, von denen das erste Systemglied eine stark zerstreuende Kittfläche aufweist und die Brennweite des dritten Gliedes, absolut gerechnet, mindestens zehnmal so groß wie die Gesamtbrenüweite des Objektivs ist, dadurch gekennzeichnet, daß die Brennweite des dritten Gliedes, absolut gerechnet, zugleich mindestens zehnmal so groß ist, sowohl wie die Brennweite des ersten Gliedes als auch wie die Brennweite des vierten Gliedes. PATENT CLAIMS.` i. Bright, asymmetrical lens, consisting composed of two collecting outer limbs and two meniscus-shaped enclosed by the latter trained members, of which the first system member is a highly dispersive Has cemented surface and the focal length of the third link, calculated in absolute terms, at least ten times the total focal length of the lens, characterized by that the focal length of the third link, calculated in absolute terms, is at least ten times at the same time is as great as both the focal length of the first link and the focal length of the fourth link. 2. Objektiv nach Anspruch z, dadurch gekennzeichnet, daß eine im dritten Glied gegen das zweite Glied konvexe Kittfläche von sammelnder Wirkung ist. 2. Lens according to claim z, characterized in that one in the third member against the second member a convex cemented surface with a collecting effect is. 3. Objektiv nach Anspruch i und 2, dadurch gekennzeichnet, daß im zweiten Glied eine vorwiegend nur chromatisch wirkende Kittfläche enthalten ist. 3. Lens according to claim i and 2, characterized in that the second member a predominantly only chromatic putty surface is included. 4. Objektiv nach Anspruch i, dadurch gekennzeichnet, daß die Brennweite des dritten Gliedes positiv ist.4. Lens after Claim i, characterized in that the focal length of the third member is positive is.
DEL90958D 1936-08-16 1936-08-16 Photographic lens Expired DE685572C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL90958D DE685572C (en) 1936-08-16 1936-08-16 Photographic lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL90958D DE685572C (en) 1936-08-16 1936-08-16 Photographic lens

Publications (1)

Publication Number Publication Date
DE685572C true DE685572C (en) 1939-12-20

Family

ID=7287171

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL90958D Expired DE685572C (en) 1936-08-16 1936-08-16 Photographic lens

Country Status (1)

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DE (1) DE685572C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926564A (en) * 1956-10-05 1960-03-01 Canon Camera Co High aperture wide angle objective
US3005379A (en) * 1957-10-22 1961-10-24 Jos Schueider & Co High-speed gaussian dual objective
US3023671A (en) * 1956-10-09 1962-03-06 Canon Camera Co Photographic objective

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926564A (en) * 1956-10-05 1960-03-01 Canon Camera Co High aperture wide angle objective
US3023671A (en) * 1956-10-09 1962-03-06 Canon Camera Co Photographic objective
US3005379A (en) * 1957-10-22 1961-10-24 Jos Schueider & Co High-speed gaussian dual objective

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