An instrument for finding the focal length of a lens; specifically an instrument for finding the chemical focus of a lens, especially in relation to the visual focus.
Origin
Early 19th century. From foc- + -imeter.
Definition of focimeter in US English:
focimeter
(also focometer)
nounfəʊˈsɪmɪtə
Optics Photography
An instrument for finding the focal length of a lens; specifically an instrument for finding the chemical focus of a lens, especially in relation to the visual focus.