Circa 1980, Meopta designed a prototype modular concept. Basic lens: Acrion f/1.8 16 mm. Atached lens: Vario Acrion f/1.8 9-30 mm. Auto and manual exposure with CdS photoresistor. Variable shutter: from 0 to 220º degrees. Basic filming speed: 18 fps. Module for other speeds: 9, 24, 36 fps, and with special unit, the speed could be increased up to 120 fps. Power source: 4 x AA batteries. Three protoypes were made.
Data assembled from: http://8mm.wz.cz/drobnohled/meoreta/meoreta.htm
Below, picture of the first prototype.
Right, picture of another prototype.