GB2033604B - Zoom lenses having front focusing group - Google Patents

Zoom lenses having front focusing group

Info

Publication number
GB2033604B
GB2033604B GB7931531A GB7931531A GB2033604B GB 2033604 B GB2033604 B GB 2033604B GB 7931531 A GB7931531 A GB 7931531A GB 7931531 A GB7931531 A GB 7931531A GB 2033604 B GB2033604 B GB 2033604B
Authority
GB
United Kingdom
Prior art keywords
zoom lenses
focusing group
front focusing
group
zoom
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
GB7931531A
Other versions
GB2033604A (en
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.)
Vivitar Corp
Original Assignee
Vivitar Corp
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 Vivitar Corp filed Critical Vivitar Corp
Publication of GB2033604A publication Critical patent/GB2033604A/en
Application granted granted Critical
Publication of GB2033604B publication Critical patent/GB2033604B/en
Expired legal-status Critical Current

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
    • G02B15/22—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 with movable lens means specially adapted for focusing at close distances
GB7931531A 1978-09-11 1979-09-11 Zoom lenses having front focusing group Expired GB2033604B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94153078A 1978-09-11 1978-09-11
US7113279A 1979-09-06 1979-09-06

Publications (2)

Publication Number Publication Date
GB2033604A GB2033604A (en) 1980-05-21
GB2033604B true GB2033604B (en) 1983-05-11

Family

ID=26751880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7931531A Expired GB2033604B (en) 1978-09-11 1979-09-11 Zoom lenses having front focusing group

Country Status (4)

Country Link
GB (1) GB2033604B (en)
HK (1) HK3684A (en)
MY (1) MY8400358A (en)
SG (1) SG52383G (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758073A (en) * 1980-10-01 1988-07-19 Vivitar Corporation Zoom lens
JP3330980B2 (en) * 1991-10-21 2002-10-07 旭光学工業株式会社 Zoom lens

Also Published As

Publication number Publication date
HK3684A (en) 1984-01-20
SG52383G (en) 1984-04-19
MY8400358A (en) 1984-12-31
GB2033604A (en) 1980-05-21

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee