Optical quartz glass convex lens(D30,f=39.2)
Optical quartz glass convex lens(D16;f40)
Optical quartz glass convex lens(D15,f=35.9)
Glass double convex lens(D20;f17.8)
Optical quartz glass convex lens(rectangle)
Optical quartz glass convex lens(D12.5;f23)
Quartz glass double convex lens(D40,f=33)