Last year marked the 100<sup>th</sup> anniversary of the death of Ernst Abbe, who passed away on January 14, 1906-just a few days short of his 65<sup>th</sup> birthday. In addition to his groundbreaking optical work, which includes his diffraction theory for image formation and the formulation of the sine condition and Abbe number, he was also a noted entrepreneur, astronomer and social reformer.

© 2007 Optical Society of America

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