Specification/ multiple C1-01 2.5 multiples C1-02 3 multiples C1-03 4 multiples C1-04 5 multiples C1-05 6 multiples C1-06 7 multiples C1-07 8 multiples For the working distance, there are five kinds for each item/ multiple specification: 370mm, 420mm, 460mm, 500mm, 550mm., so that you can choose any multiple and working distance.