Device for forming an immersion film

A device for forming an immersion film between a front lens of an objective of a microscope and a preparation being examined using the microscope, the device comprising a protection device for preventing fluid leakage from an immersion film region, and an apparatus supplying immersion fluid to the immersion film region and having supply, discharge, control, and sensor lines, wherein the protection device is arranged statically in a main part of a stand of the microscope and the apparatus supplying immersion fluid to the immersion film region is connected to the protection device through a separate system inhibiting liquid ingress to the immersion film region, wherein the protection device comprises a stationary base plate having a cutout centrically oriented toward a beam path of the microscope, the cutout receiving an elastic membrane, the elastic membrane having an opening centrically oriented toward the beam path for the front lens of the objective, and wherein the membrane is double-walled and comprises two single membranes superimposed upon each other, the single membranes defining a space therebetween through which the immersion fluid can be supplied and drained.