In some applications (for example some laser-based imaging techniques), the best result can be achieved with a bare sensor unit.
All Basler cameras have a cover glass above the sensor. This glass also has filtering qualities, and it effectively blocks all wavelengths below 400 nm from entering the sensor. The glass can not be removed from the sensor, as it is in most cases glued on to the sensor. It is not recommended to try and remove the glass by using grinding technology or other methods, as the risk of damage to the camera and sensor is very high. If the user decides to remove the cover glass anyway, will also void the warranty of the camera.