Claims
- 1. A camera on which a front converter can be mounted, comprising:
- judging means for judging whether or not a front converter is mounted on said camera;
- means for changing an effective focal length accomplished by a taking lens of said camera in response to a manual operation; and
- controlling means operable when said judging means judges that a front converter is mounted on said camera for operating said changing means to establish said effective focal length of said taking lens at a long focal length.
- 2. A camera as claimed in claim 1, wherein said effective focal length includes a first focal length and a second focal length longer than said first focal length, and said taking lens is set at said second focal length when said judging means judges a front converter is mounted on said camera.
- 3. A camera as claimed in claim 2 further comprising display means for displaying a first character corresponding to said first focal length, a second character corresponding to said second focal length and a third character corresponding to a compound focal length achieved by said second focal length and said front converter.
- 4. A camera as claimed in claim 2, wherein said first focal length is a real focal length and said second focal length is a pseudo focal length.
- 5. A camera on which a front converter can be mounted comprising:
- a taking lens;
- circuit means for selecting an effective focal length accomplished by said taking lens in response to a camera external operation; and
- means for discriminating that said front converter is mounted on said camera and for causing said circuit means to select a long focal length when it discriminates that said front converter is mounted on said camera.
- 6. A camera as claimed in claim 5, wherein said effective focal length includes a first focal length and a second focal length longer than said first focal length, and said effective focal length of taking lens is set at said second focal length when said discriminating means discriminates that said front converter is mounted on said camera.
- 7. A camera as claimed in claim 6, wherein said first focal length is a real focal length and said second focal length is a pseudo focal length.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-129510 |
Jun 1986 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 139,854 (of 056,688), filed 12/30/87 (Parent filed 6/2/87) both now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3490844 |
Sapp, Jr. |
Jan 1970 |
|
4583831 |
Harvey |
Apr 1986 |
|
4728973 |
Taniguchi et al. |
Mar 1988 |
|
Foreign Referenced Citations (6)
Number |
Date |
Country |
60145428 |
Sep 1955 |
JPX |
5426721 |
Feb 1979 |
JPX |
61-151518 |
Jul 1986 |
JPX |
61-153620 |
Jul 1986 |
JPX |
61-153627 |
Jul 1986 |
JPX |
61-153629 |
Jul 1986 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
56688 |
Jun 1987 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
139854 |
Dec 1987 |
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