在20世纪的60年代末至80年代中期,是我国1 20型双镜头反光相机生产的鼎盛时期,其品牌之多、产量之大,是国产相机制造史上前所未有的。而奇特的是绝大部份相机制造厂所生产的1 20相机的外型和技术指标,均以上海照相机厂的“海鸥”4B型为蓝本,就连当时的兵器工业部下属的光学、机械制造等军工企业,也都相继规模化加入 In the late 1960s to the mid-1980s, it was the heyday of the production of 120-type dual-lens reflex cameras in China. As many brands as it produces, it is unprecedented in the history of domestic camera manufacturing. The peculiar is the vast majority of camera manufacturers produced 1 20 camera appearance and technical indicators are based on the Shanghai Camera Factory “Seagull” 4B modeled, and even then the Ordnance Division under the optical, mechanical Manufacturing and other military enterprises, have also joined in large-scale