long-focus lens中文什么意思

长焦距透镜

• long:    adj. (longer longe ...
• focus:    n. (pl. focuses, f ...
• lens:    n. (pl. lenses) 1. ...

百科释义

In photography, a long-focus lens is a camera lens which has a focal length that is longer than the diagonal measure of the film or sensor that receives its image.