Table 2.

Tolerance values for the NA0.55 needle achromatic objective.

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