Patent ID: 8586946

Claim:
A test apparatus for an optical investigation system, with an imaging device and a light source for optical investigation of an object in remitted light and/or fluorescent light, with: a housing with a hollow space and an aperture for inserting a distal end of the imaging device into the hollow space; a reference surface with predetermined optical properties in the hollow space, at least either for remission of illuminating light directed onto the reference surface or for emission of fluorescent light; a positioning device to hold the imaging device at a predetermined position of the distal end of the imaging device in relation to the reference surface; wherein said positioning device comprises a tube having an interior which substantially conforms to the imaging device and an end which is partially closed; and, wherein said positioning device has on its end facing the hollow space a mechanical stop that is configured so that the distal end of the imaging device inserted into the test apparatus is at a predetermined position when the imaging device is contiguous with the stop.