Based on the analysis for propagation characteristics of the light traveling in water,several essential factors in underwater photography,such as energy attenuation,field loss and water proof,are discussed.

Through the improvement and innovation of the tieback technology,the underwater video was applied to observe the subsea wellhead,at last,the tieback was successful which can guide the sub sea wellhead tieback for the future.

The use of contrast On television filming and production practices;

Taking the example of the making of special-topic films of Human Provincial People s Hospital,the paper introduces how to write good scripts,arrange filming and make communications between the two parties.

In order to obtain the clear and flow visualization image and improve the quality of fluid visualization photographic image,it is usually necessary to make tracer particles enlarged for shooting or near shooting and to distinguish the contrast degree between the background and the tracer particles.

Photographs shooting by digital camera possess the same legal validity with traditional camera,have more convenient operation and lighten foundation units administration expenses.

The shooting method and implementation of the"frozen time"digital video special effect are studied,and a new full- digital shooting system of"frozen time"special effect is established.

From practice, the writer summaries up some regulations for shooting demonstration lessons, and proposes that different demonstration lessons should adopt different ways, and also concretely expounds the process of selecting video cameras, setting up the position of video cameras, recording voice and so on.

There are some disadvantages in shooting medical operate-type video textbook according to the order of separate lens manuscripts: low shooting speed and efficiency,and difficulty in linking up the various factors among the lens.