An electronic eyepiece for the observation of near infra‐red of the spectrum is described. It can be attached to any spectroscope and consists of an image tube of the type 1‐P‐25 which converts an infra‐red image into a visible one. The spectrum is projected by the telescope system of the spectroscope upon the mosaic face of the image tube. The infra‐red radiation releases photoelectrons from the mosaic face of the image tube which are focused electron‐optically upon a fluorescent screen. The image appearing on the fluorescent screen can be observed directly or magnified optically. The visible range of a spectroscope equipped with an electronic eyepiece extends the visible range to approximately 1150 m&mgr; into the infra‐red and to 300 m&mgr; into the ultraviolet.