Lens barrel
AssigneeCanon Kabushiki Kaisha
InventorMasanori Ishikawa
Life of this patent
Estimating the term…
Abstract
The present invention relates to a lens barrel with an extender attachable thereto, and comprises a focusing lens movable in directions of an optical axis, a position detecting member for detecting a position of the lens, a data detecting member for detecting information on the extender, and a forbidding member for setting a permissible area in which the autofocusing is permitted with respect to the position of the lens based on the information, permitting the autofocusing when the position of the lens is within the permissible area, and forbidding the autofocusing when the position of the lens is out of the permissible area.
Claims10
A lens barrel to which an extender is attachable, comprising:
- a movable focusing lens;
- position detecting means for detecting a position of said lens;
- data detecting means for detecting an information as to said extender;
- and
- forbidding means for setting a permissible area in which autofocusing is permitted with respect to the position of said lens based on said information, permitting said autofocusing when the position of said lens is within said permissible area, and forbidding said autofocusing when the position of said lens is out of the permissible area.
A camera comprising:
- a lens barrel having a movable focusing lens;
- an extender attached in between said lens barrel and a camera body;
- a TTL autofocus system;
- position detecting means for detecting a position of said lens;
- data detecting means for detecting an information on said extender;
- and
- forbidding means for setting a permissible area in which autofocusing is permitted with respect to the position of said lens based on said information, permitting said autofocusing when the position of said lens is within said permissible area, and forbidding said autofocusing when the position of said lens is out of said permissible area.
Dependencies are inferred from the claim text.