... Spherical aberration, coma, and astigmatism are also easily observed using the star test. ... Off-axis images are complex. ... Fig. ... Diffraction by a circular aperture as a function of defocus for no aberration Airy Disk 1 wave defocus Less than 1 wave defocus Fig. ... Diffraction by a circular aperture as a function of defocus for third-order spherical aberration Paraxial Focus Small distance inside paraxial focus Moderate distance from marginal focus Immediate neighborhood of marginal focus Fig...

... Gerhard THIELE . Flight Engineer-1 . ... During the STS-55/Spacelab D-2 Mission (from April 26 to May 6, 1993) Thiele performed the co-ordinator functions for communication with the crew and served as alternate payload specialist in the Payload Operations Control Center of DLR at Oberpfaffenhofen. ... German Astronaut Gerhard Thiele, mission specialist presenting the European Space Agency during his first space flight onboard the Endeavour Shuttle (STS-99) at a period of February 11-22, 2000. ...

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