Drum lenses are glass spheres, ground down axially to provide a mounting surface. The ground circumference D simplifies handling issues typically associated with ball lenses.
Specifications
Material
BK7
Nd=1.517
LaSFN9
Nd=1.850
Diameter Tolerance
+/-0.0025
Length Tolerance
±0.01mm
Surface Quality
40-20
Size D x L (mm)
2.0x2.5
2.4x3.0
3.2x4.0
4.0x5.0
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