Lens apparatus and imaging apparatus detachable therefrom

Abstract

An imaging apparatus includes a sensor configured to photoelectrically convert light from an object to output a signal, a selection unit configured to select one of a first exposure control mode and a second exposure control mode having an exposure changing amount per unit time larger than that of the first exposure control mode, and a controller configured to perform control to transmit diaphragm control information generated based on the output signal from the sensor, first information, and second information to a connected lens unit, wherein the first information is about the exposure control mode selected by the selection unit, and the second information is speed information of a diaphragm unit corresponding to the lens unit.

What is claimed is: 
     
         1 . A lens unit including a lens, the lens unit comprising:
 a diaphragm unit configured to control exposure to adjust an incident light amount;   a memory configured to store speed information for driving the diaphragm unit; and   a controller configured to output the speed information stored in the memory to an external apparatus,   wherein the controller controls the diaphragm unit based on diaphragm control information periodically transmitted from the external apparatus.   
     
     
         2 . The lens unit according to  claim 1 , wherein the diaphragm control information is associated with an exposure control mode of the external apparatus. 
     
     
         3 . The lens unit according to  claim 1 , wherein the diaphragm control information is transmitted from the external apparatus connected via a communication unit. 
     
     
         4 . The lens unit according to  claim 1 , wherein the speed information of the diaphragm unit includes information about a variable range of controllable responsiveness of the diaphragm unit. 
     
     
         5 . The lens unit according to  claim 1 , wherein the speed information of the diaphragm unit is generated in association with stored information about a variable range of controllable responsiveness of the diaphragm unit. 
     
     
         6 . The lens unit according to  claim 1 , wherein the speed information of the diaphragm unit indicates a minimum speed at which the diaphragm unit is able to be driven.