Leica Camera Ag

Ulrich Lies

Gerhard Kranz

Robert Denk

Oliver Zielberg

A method for determining the current camera aperture (working aperture) of lenses on digital cameras having a viewfinder eyepiece and internal exposure measurement through the lens is wherein a further external exposure measurement is carried out past the lens and the value of the working aperture is determined from a reference table stored in the digital camera from the difference &#x394;BV between the two measured exposure values BV(int) and BV(ext). A digital camera suitable for carrying out the method wherein outside the region covered by the lens tube, the housing of the digital camera has an additional window for a further exposure meter with an upstream optics that is directed onto the subject and serves to restrict the shooting angle, and includes a memory for a reference table for determining the aperture value.

Diaphragm value recognition

An interchangeable lens connects in a prescribed position to a support surface on a camera of a camera system using a locking apparatus. A method and apparatus for identifying interchangeable lenses uses optical radiation. After the locking operation is performed, a defined optical radiation is directed from two or more, preferably six, light transmitters arranged in the support surface to reflecting or absorbing surfaces on the locking apparatus which are assigned to said light transmitters. The radiation returning from the respective reflecting/absorbing surfaces is picked up by light receivers arranged next to the light transmitters in the support surface. A binary coded signal for identifying the interchangeable lens is formed from the output signals of the light receivers.

Method and apparatus for identifying interchangeable lenses

An interchangeable lens () with a locking device (') for system cameras is described, wherein an orientation marking () for mounting the locking device (&#x2032;) on the camera is provided at the end of the lens housing () facing the camera, and the contact surface () of the locking device (&#x2032;) has a latching depression () at a distance from the orientation marking () counter to the direction () of rotation of the locking operation and the contact surface () contains at least two, preferably six, surface areas () which are situated next to one another in an isolated fashion at a distance from the latching depression () counter to the direction () of rotation within an angle segment of from 100&#xb0; to 160&#xb0;, preferably 110&#xb0; to 150&#xb0;, and can be detected individually by optical means.

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Wetzlar, Germany

Ulrich Lies