Patent ID: 7834990

Claim:
An evaluation method for evaluating optical characteristics of an optical system, the evaluation method comprising: providing a reflection optical system that is an evaluation object and that has a light incidence section and a light emission section, the reflection optical system including an aspheric mirror or a free-form surface mirror; disposing a first pattern having a fist predetermined pitch, in an optical path of light which is incident onto the light incidence section; disposing a projection surface having a second pattern with a second predetermined pitch, at the position to which the light emitted from the light emission section is reached; projecting an image of the first pattern onto the projection surface through the reflection optical system; and evaluating the optical characteristics of the aspheric mirror or the optical characteristics of the free-form surface mirror by observing a state of moiré fringes which are generated onto the projection surface due to interference between the image and the second pattern.