Leica ts09plus Prism Constant

-34.4 mm. The prism constant of Leica TS09plus is -34.4mm, which is an important parameter used to correct the observation error of prism in Leica measuring instruments. By setting the prism constant accurately, the precision and accuracy of measurement can be improved. It takes too long for light to travel in a reflective prism, which will increase the measured distance by a certain value. That is to say, the speed of light traveling in glass is slower than that in air, which is called prism constant.