I’m working on finalizing a lens design for a prototype. I’ve run a tolerance analysis on my lens and I’m working with vendors on manufacturing. Different vendors have communicated different metrics/units for various tolerance values than what I’ve used in my tolerance analysis, and I would like to know how to convert between these units/metrics.  In particular:

Radius: I’ve modelled this in terms of fringes at a test wavelength and would like to convert to percentage or millimeters of error.

Surface Decentration:  I’ve modelled this in millimeters of decentration.  Vendors usually quote it in terms of arcminutes of beam deviation.  I would like to convert between the two.

How can I convert these values?  If there are other tolerance values with useful conversions, it would be useful to learn about those too.

Thanks!