## Peak-to-valley Vs RMS

[hmtad name=”Adsense Unit 2″ align=”center”][hmtad name=”Adsense Unit 2″ align=”center”]What is an optic surface figure? The surface figure, or surface quality or surface cosmetics all refer to the deviation between an actual optic and its ideal surface. There are basically two set of information that are commonly given by manufacturers: the surface flatness and what is […]