We describe an imaging spectrograph with high spectral resolution (0.3 ¿) that uses an echelle grating without the conventional cross disperser. The spectrograph covers the entire visible region. However, only 5--20 wavelength regions can be observed simultaneously. The total wavelength coverage is limited by the number of available pixels on the detector and for a 1024¿1024 pixels detector is ~100--300 ¿. Order separation is achieved by a mosaic of interference filters located at the image plane. ¿ 2001 American Geophysical Union