DE1447293A1 - Photographic lens with adjustable focal length - Google Patents
Photographic lens with adjustable focal lengthInfo
- Publication number
- DE1447293A1 DE1447293A1 DE19641447293 DE1447293A DE1447293A1 DE 1447293 A1 DE1447293 A1 DE 1447293A1 DE 19641447293 DE19641447293 DE 19641447293 DE 1447293 A DE1447293 A DE 1447293A DE 1447293 A1 DE1447293 A1 DE 1447293A1
- Authority
- DE
- Germany
- Prior art keywords
- lens group
- lens
- focal length
- divergent
- meniscus
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
Photographisches Objektiv veränderbarer Brennweite Der Erfindung liegt die Aufgabe zugrunde, fÜr das.Kleinbild-2 Format 24 x 36 mm ein photographisches Objektiv veränderbarer Brennivieite mit der Öffnung"f : 4 und einem B:#ennweiten-Dehnungsbereich von etwa 85 #c- f g 250 mm zu entwickeln. Es ist bekannt, Objektive veränderbarer Brennweite aus vier Wirkungsgruppen aufzubauen, und zwar einer sammelnden ersten Linsenn'ruppe (A), einer zerstreuenden zweiten Linsengruppe. (B), einer zerstreuenden dritten Linsengruppe (C) und einer sammelnden vierten Linsengruppe (D),. wobei.die Xnderung der Brennweite dadurch bewirkt wird, daß die beiden zerstreuenden Linsengruppen (B und C) relativ zueinander und relativ zu den beiden sammelnden Linsengruppen (A und D) längs der optischen Achse verschoben werden. Die Erfindung betrifft Objektive dieser Bauform. Erfindungsgemäß wird vorgeschlagen, ein fÜr den angegebenen Zweck vorgesehenes Objektiv so aufzubauen, daß die Kombination der folgenden Merkmale erfüllt ist: a) Die sammelnde erste Linsengruppe besteht aus mindestens drei Linsen, und zwar einer meniskenförmigen zur Blende hohl-gekrämmten zerstreuenden Frontlinse und mindestens zwei Sammellinsen; die Glieder der ersten Linsengruppe sind sämtlich so durchgebogen, daß für jedes dieser Glieder die Beziehung b v - b h > 0 besteht (bv = Brechkraft der vorderen, b h Brechkraft der hinteren Glas-Luft-Fläche des betreffenden Gliedes); die Brennweite (f A ) der ersten Linsengruppe liegt innerhalb der Grenzen 0,66-f M und 1,0.f. Photographic lens with variable focal length The invention is based on the task of providing a photographic lens with variable focal length for das.Kleinbild-2 format 24 x 36 mm with the opening "f : 4 and a B: # expansion range of about 85 # c- fg 250 It is known to build objectives of variable focal length from four action groups, namely a converging first lens group (A), a diffusing second lens group (B), a diffusing third lens group (C) and a converging fourth lens group ( D), whereby the change in the focal length is effected in that the two diverging lens groups (B and C) are displaced relative to one another and relative to the two converging lens groups (A and D) along the optical axis According to the invention it is proposed to build a lens intended for the stated purpose so that the combination of the following features e The following is filled: a) The converging first lens group consists of at least three lenses, namely a meniscus-shaped diffusing front lens which is hollow-curved towards the diaphragm and at least two converging lenses; the members of the first lens group are all bent in such a way that for each of these members the relationship b v - b h > 0 exists (bv = refractive power of the front, b h refractive power of the rear glass-air surface of the relevant member); the focal length (f A) of the first lens group lies within the limits 0.66-f M and 1.0.f.
wobei f M die max--'Lmale Brennweite des Gesamtobjektivs bedeutet.where f M is the maximum focal length of the lens as a whole.
b) Die zerstreuende zweite Linsengrüppe enthält drei Glieder, und zwar ein zur Blende hohl gekrümmtes meniskenförmiges Zerstreuungsglied, ein bikonkaves zerstreuendes Verbundgliedj welches aus zwei miteinander verkitteten Linsen entgegengesetzter Brechkraft besteht, und ein zur Blende hohl gekrümmtes meniskenförmiges Sammelglied; der Luftraum zwischen den 'beiden letzterwähnten Gliedern liegt innerhalb der Grenzen - 0205 - f B und 0,30 - fB) wobei f B die Brenn#,rieite der zweiten Linsengruppe bedeutet; die Radien der diesen Luftraum begrenzenden Flächen liegen beide innerhalb der Grenzen --0950 - f B und - 2100 - f B* c) Die zerstreuende dritte Linsengruppe besteht aus einem--zur Blende erhaben gekrümmten meniskenförmigen zerstreuenden Verbundgliede, welches aus zwei miteinander verkitteten Linsen entgegengesetzter Brechkraft zusammengesetzt ist. b) The second group of divergent lenses contains three members, namely a meniscus-shaped diffuser member which is hollowly curved towards the diaphragm, a biconcave diffusing composite member which consists of two cemented lenses of opposite refractive power, and a meniscus-shaped collector member which is hollowly curved towards the diaphragm; the air space between the two last-mentioned members lies within the limits - 0205 - f B and 0.30 - fB) where f B is the focal length of the second lens group; the radii of the surfaces delimiting this air space are both within the limits --0950 - f B and - 2100 - f B * c) The diffusing third lens group consists of a meniscus-shaped diffusing composite member that is raised to the diaphragm and consists of two lenses cemented together opposite refractive power is composed.
d) Die sammelnde vierte Linsengruppe enthält die Aperturblende. d) The collecting fourth lens group contains the aperture stop.
e) Zwischen den Brennweiten f., f BI f Cl fD der einzelnen Linsengruppen und der maximalen Brennweite f des M Gesamtobjektives besteht die Beziehung - f B < 1,6-f D < f A < f M < - f C. e) The relationship between the focal lengths f., f BI f Cl fD of the individual lens groups and the maximum focal length f of the overall M objective is - f B < 1.6-f D <f A <f M < - f C.
In der foljenden 2abelle sind die Fürtigungsdaten fÜr ein Objektiv -em#ß der Erfindung angegeben.In the following table are the certification data for a lens -em # ß specified of the invention.
Die beifolgende Abbildung zeigt den Linsexischnitt durch dieses 0b4ektiv.The following illustration shows the linsexi cut through this lens.
U
der Tabelle und in der Abbildung sind bezeichnet
mit L ... #... die Lineung mit r ....... die Radien, mit
d ....... die.Scheitelabstände, mit ne die Brechungsindices, Mit Ve die Abbeschen
Zahlen für die a e-Linie des Spektrums, mit s' ...... die Schnittweite.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ0011040 | 1964-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1447293A1 true DE1447293A1 (en) | 1969-05-08 |
Family
ID=7621662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19641447293 Pending DE1447293A1 (en) | 1964-08-20 | 1964-08-20 | Photographic lens with adjustable focal length |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1447293A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2911794A1 (en) * | 1978-03-27 | 1979-10-04 | Canon Kk | ZOOM LENS |
DE2900977A1 (en) * | 1979-01-12 | 1980-07-17 | Zeiss Carl Fa | VARIO-SONNAR |
-
1964
- 1964-08-20 DE DE19641447293 patent/DE1447293A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2911794A1 (en) * | 1978-03-27 | 1979-10-04 | Canon Kk | ZOOM LENS |
DE2900977A1 (en) * | 1979-01-12 | 1980-07-17 | Zeiss Carl Fa | VARIO-SONNAR |
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