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Optical Features

Spot diagrams

The spot-diagrams of the FS-60CB show the excellent chromatic correction at prime focus, ensured by the the Fluorite doublet, and the good behavior of the diffraction pattern, including at 14mm off-axis distance. We will note also the important role of the flattener for a wide-field photographic use. It allows the use without restriction of the most recent DSR/DSLR or CCD cameras.