Case
included
The
floating styles are equipped with Polaroid Polarizing lens,
technical
name is S13. The support layers of this material is CAB (Cellulose
Acetate
Butyrate). It is a 7 layer laminate with a high quality scratch
resistant
hardcoating. The whole lens is presspolished and optically correct,
optical
class 1, CE standard.
CAB
has advantages and disadvantages...
+unbreakable
+99% polarizing efficiency
+100% chipping free
+optically class 1, power readings and refraction is excellent
-fairly scratch resistant 2.5 HD
+lightest weight
+very good thermal stability
-distortion along frame edges possible
