In 1974 Minox introduced a very compact (100 mm × 61 mm × 31 mm), glass fibre reinforced Makrolon bodied 35 mm film camera designed by Professor Fischer of Vienna University: the Minox EL, the first one in Minox 35 mm series. These compact cameras featured a drawbridge style lens cover which when lowered brought forward a 35 mm focal length f/2.8 four-element, three-group Tessar-type Minotar/Minoxar lens with between the lens leaf shutter and diaphragm, a center positioned viewfinder, two stroke film winder lever and a film rewind knob. The Minox 35 camera back must be removed for loading or unloading film.