A camera is provided that comprises an image sensor for detecting image data from a detection region and a reception optics arranged in front of the image sensor, a focus adjustment unit having a thread for changing the position of focus of the reception optics by way of a rotary movement and a front screen. In this connection the reception optics has a front region having an inner contour that is accessible via the front screen in order to rotate the reception optics from the outside in the thread and to thus adjust the focus.