Dear microscopists, recently it has happened far too frequently again that immersion oil ended up on water and air objective lenses, particularly on CF3, and sometimes the whole objective turret is full of oil. This can create considerable problems for other users and time to clean, especially if the oil goes inside the objective turret. Sometimes users get no or bad quality images from their samples, and more inexperienced users might not even be able to identify the source of the problem. Can ALL of you please be more careful to avoid this problem! If you are not sure what type of objective lens is in the selected position, please ask! If you add oil to an air or water lens by mistake, please tell us! It avoids problems for other users, and if done quickly, it's much easier to clean then later when the oil hardens. Thanks for your cooperation, good imaging, Martin -- ------------------------------------------------------------------------ *Martin Spitaler, PhD* *FILM - Facility for Imaging by Light Microscopy* - Facility Manager - Sir Alexander Fleming Building 401 Imperial College London / South Kensington Exhibition Road London SW7 2AZ UK