... It consists of some nine circular plates, with annular apertures to let the photons pass through to the mirrors. ... Surfaces may be partially transparent (via input of an absorption depth), and may be composed of struts and annular plates. ...
... multi-aperture fractional pixel photometry through circular, elliptical, rectangular, or polygonal object apertures, a concentric annular or offset circular, elliptical, rectangular, or polygonal sky aperture, and multi-aperture shape analysis using ...