短焦距透镜
short focal length lens
short focal length lens (=short-focus lens
short-focus lens
长焦透镜焦距
telephoto lens focal length
凹透镜焦距
focal length of concave lens
可变焦距透镜
variable focal length lens
variable focus zoom lens
zoom lens
variable focus lens vari-focus lens
vari-focus lens variable focus lens
Zoomar lens
vari-focal lens
热透镜焦距
Thermal lens
Thermal lens focus
thermal lens focal length
Thermal focal length