Television (TV) camera for EMs is used to observe and/or record electron microscope (EM) images for computer input, in situ observation, and multi-user observation. The TV observation is performed by a TV camera in combination with a dedicated fluorescent screen. In this case, the EM image is converted to a light image by the fluorescent screen.

Because of the limit of depth of focus and because no lens in between the recording media and TEM viewing screen can be used to compensate for the out-of-focus, the recording film or CCD camera is arranged to locate just several centimeters below the screen. However, the specimen image on the recording media is still out of focus if the image has been brought to exact focus on the TEM screen.