Special Features
Black arrow on periphery. Front and back surfaces coated with magnesium fluoride. Chamfer edges 0.010 in. To 0.015 in. By 40 to 50 deg. Rim and chamfers ground.
Description
Type 531-621 and type 603-380 grade b class 1 mil-g-174 optical glass material.
Diameter
Between 2.123 inches and 2.125 inches
Axial Thickness
Between 0.464 inches and 0.472 inches and 0.278 inches and 0.286 inches
Compound Lensaxial Thickness
Between 0.742 inches and 0.758 inches
Equivalent Focal Length
8.126 inches
Back Focal Length
7.772 inches
Front Focal Length
7.992 inches
Refraction Index
1.5310 and 1.6030
Abbe Constant
62.100 and 38.000
Compound Lens Style
Doublet
Individual Lens Style
Double convex and meniscus diverging
Element Left Surface Radius
-3.167 inches and 5.391 inches
Element Right Surface Radius
-3.167 inches and 12.399 inches
Material
Glass, optical, mil-g-174, class 1, grade b, type 531-621 and type 603-380