JPS59173018U

JPS59173018U - attachment lens

Info

Publication number: JPS59173018U
Application number: JP6755783U
Authority: JP
Inventors: 常文田中
Original assignee: キヤノン株式会社
Priority date: 1983-05-06
Filing date: 1983-05-06
Publication date: 1984-11-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第′１図は本考案の一実施例に係るアタッチメントレン
ズを装着したズームレンズを例示する断面図、第２図は
該ズームレンズの無限遠物体に対する収差図、第３図は
同じく物体距離１ｍに対ｊる収差図、第４図は物体距離
１ｍにおいて上記ズームレンズに本考案の上記実施例に
係るアタッチメントレンズを装着したときの収差図、第
５図は本考案の他の実施例に係るアタッチメントレンズ
を装着したズームレンズの断面図、第６図、第７図およ
び第８図はその収差図であって、夫々第２図、第３図お
よび第４図と同じ条件のときのものである。第４図１ワ６　　　　　　　　　− ＼Ｉ　　　　　　［球面収差　　　　　　　　Ｊト点時又差第６図球面収差　　　　　　　　非点ｌｘ差Fig. 1 is a sectional view illustrating a zoom lens equipped with an attachment lens according to an embodiment of the present invention, Fig. 2 is an aberration diagram of the zoom lens with respect to an object at infinity, and Fig. 3 is a sectional view illustrating an example of a zoom lens equipped with an attachment lens according to an embodiment of the present invention. Figure 4 is an aberration diagram when the attachment lens according to the above embodiment of the present invention is attached to the zoom lens at an object distance of 1 m, and Figure 5 is an attachment according to another embodiment of the present invention. The cross-sectional views of the zoom lens with the lens attached, FIGS. 6, 7, and 8 are aberration diagrams thereof, and are taken under the same conditions as in FIGS. 2, 3, and 4, respectively. . Figure 4 1 6 - \I [ Spherical aberration J point difference Figure 6 Spherical aberration Astigmatism lx difference

Claims

[Scope of Claim for Utility Model Registration] 1. An attachment lens that is attached to a photographic lens when photographing a subject that is outside the proper subject distance range specific to the photographic lens, which has no refractive power on the optical axis and has no refractive power toward the periphery. An attachment lens characterized by being composed of a single aspherical lens that produces 2. The attachment lens according to claim 1 of the utility model registration claim, which is attached to the subject side of the photographic lens. 3. The attachment lens according to claim 1 of the utility model registration claim, which is inserted into the intermediate portion of a photographic lens. 4. The attachment lens according to claim 1, which has no refractive power on the optical axis and has negative refractive power toward the periphery. 5. The attachment lens according to claim 1, which is attached to a photographic lens when photographing a subject at a close distance outside the proper subject distance range specific to the photographic lens.