A split diopter is a standard diopter element which is precision-cut in half and mounted in a ring. It allows you to focus both fore- and background at the same time. Hence, it can attract the viewer’s attention to an object in the back while the main scene remains focused.
Their strength is given as reciprocal of focal length in meter (so called diopter), e.g.:
+ 1 diopter = 1 meter infinity focus plane
+ 2 diopter = 0.5 meter infinity focus plane
Diopter Strengths: +1/2, +1, +2, +3
