Abstract: An imaging system includes a changing device. The changing device includes a changing holder configured to receive an optical element, an access element having an open state and a closed state, and a bistable element having a first stable state and a second stable state. The bistable element is configured to transition from the first stable state to the second stable state upon opening of the access element and to remain in the second stable state upon closing of the access element. The imaging system includes a controller configured to determine whether the bistable element is in the first stable state or the second stable state, and to determine that the access element has been opened and thereby access to the optical element has been enabled upon determining that the bistable element is in the second stable state.

Abstract: A microscope includes an illumination device having a light source and two current control devices. Each of the current control devices has a target value input and a measuring resistor arrangement. The current control devices supply a through-current for the light source and control a level thereof by way of a potential difference across the measuring resistor arrangement on the basis of a signal provided at the target value input. An adjustment device is configured to set two different illumination types of the microscope. The adjustment device and the illumination device are operatively connected to each other such that setting a first illumination type switches the illumination device into a first current configuration, in which at least one current control device supplies no through-current, and setting a second illumination type switches the illumination device into a second current configuration, in which at least one control devices supplies a through-current.