水下微光摄影物镜的设计和研究

增大视场角和相对孔径是提高水下微光摄影物镜性能的重要手段。介绍大视场大相对孔径水下微光摄影物镜的设计方法和特点。基于反摄远结构采用11片镜片设计了相对孔径为1/1.4,水下全视场角66°,焦距11.8mm的水下微光摄影物镜。质量评价结果表明:设计的摄影物镜成像质量优异，在空间频率为42lp/mm时0.7ω的MTF值高于0.5，且达到各项性能指标,能够满足水下微光摄影物镜对大视场大相对孔径的需求。

Design of underwater low light photographic objective

The enlargement of FOV and the relative aperture is the key measure to improve the performance of underwater photographic objective under weak illumination. The characteristics and design methods of WFOV and large relative aperture underwater photography objective under weak illumination are introduced. An underwater photographic objective under weak illumination, whose relative aperture was 1/1.4, underwater FOV was 66° and focal length was 11.8mm, was designed based on the reverse-telephoto structure with 11 optical elements. The imaging quality of this lens was evaluated. The results show that it has an excellent imaging quality, at spatial frequency of 42lp/mm, its MTF value is greater than 0.5 for 0.7ω, and it meets all the specifications and requirements of WFOV and large relative aperture for underwater photographic application.