Controls: Form of actual surface relative to perfect form

Related Terms: Form Error, Rt, Rq

Units: Linear units

Specification Must Contain: Value (RMS, Peak-to-Valley, +/- Sag Error or combination) over an aperture

Optimax Preferred Specification: +/- Sag Error in units of microns

Reasons: Change is relative to nominal form

Manufacturing Standards: ISO 10110-12, OEOSC OPI.006

Irregularity: Profilometer

Find out more by downloading our technical note on Irregularity


Optimax - Optics Tolerance Attributes

America's largest prototype optics manufacturer is a lean factory specializing in fast cost-effective manufacturing of prototype and OEM optics up to 300mm in diameter. Dedicated to small volumes, high quality and quick delivery, Optimax is America's largest prototype manufacturer of precision optical components, offering prototype lenses in 1 week! With lean practices set up throughout the shop, we are both capable and efficient. We specialize in aspheres, cylinders, prisms, and spheres up to 300mm in diameter. Our coating capabilities allow us to complete challenging projects, from start to finish, in house. Our dedication remains to small volume, high quality, and quick delivery. Check us out at