Detail Specifications
Axial Thickness:
0.450 inches and 0.232 inches
Compound Lensaxial Thickness:
0.682 inches
Compound Lens Edge Thickness:
0.500 inches
Equivalent Focal Length:
12.237 inches
Back Focal Length:
11.879 inches
Refraction Index:
1.5110 and 1.6053
Abbe Constant:
63.500 and 43.600
Compound Lens Style:
Doublet
Individual Lens Style:
Double convex and meniscus diverging
Element Left Surface Radius:
6.614 inches
Element Right Surface Radius:
2.728 inches
Material:
Glass, optical, jan-g-174, grade b
Material:
Glass, optical, jan-g-174, grade b
Fsc Application Data:
Periscope, m20a28 integrated with fire control equipment
Item Name:
Collimator,lens
Manufacturer Part Numbers
No other part numbers with same form, fit, and function found.