FITEC OPTICS make asphere with custom diamond turned(CNC manufacturing) as well as with molded asphere.
Custom asphere tolerance:
Parameter	Commercial (standard)
Effective Focal Length (EFL)	± 1%
Center Thickness (CT)	± 0.025 mm
Outer Diameter (OD)	± 0.015 mm
Wedge (arcmin)	4
Power/Irregularity (fringes)	3/0.5
Surface Roughness	PV< 1 μm RMS<0.15μm
Surface Quality (scratch/dig)	40/20
*Manufacturability depends on size & shape of the optics, as well as production volume
Molded asphere tolerance:
Parameter	Commercial (standard)
Effective Focal Length (EFL)	± 1%
Center Thickness (CT)	± 0.025 mm
Outer Diameter (OD)	± 0.015 mm
Wedge (arcmin)	4
Power/Irregularity (fringes)	3/0.5
Surface Roughness	PV< 2 μm RMS<0.25μm
Surface Quality (scratch/dig)	60/40
*Manufacturability depends on size & shape of the optics, as well as production volume