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. 2013 Sep 3;18(9):096003. doi: 10.1117/1.JBO.18.9.096003

Table 2.

Tolerance values for the NA0.55 needle achromatic objective.

Operand Value
Radius of curvature (%) ±1
Thickness (μm) ±20
Element decenter (μm) ±10
Element tilt (deg) ±0.15
Doublet decenter (μm) ±15
Doublet tilt (deg) ±0.2
Surface irregularity (fringes) ±1
Index (%) ±1
Abbe number (%) ±1