Optical imaging device, in particular objective with at least one system diaphragm

An optical imaging device, in particular a lens, has a system diaphragm (1). An aperture of the system diaphragm (1) is in the opening diameter (D) adjustable. The respect to the optical axis (4) of the system diaphragm (1) axial position of the aperture of the system diaphragm (1) is a function of the aperture diameter (D) of the system diaphragm (1) determined.