Glass, optically worked, back silvered both concave & convex type. I : Convex (cx) II : Concave (cv)
(I) CV (II) CX
Dia (mm) Focal Length(mm)
a) 38 75
b) 38 100
c) 38 150
d) 38 200
e) 38 300
f) 50 75
g) 50 100
