Field flattener lenses are used in modern binocular designs (e.g. Canon 10 x 42 L IS WP, 18 x 50 IS All Weather and Swarovski EL 8.5 x 42, EL 10 x 42) and in astronomic telescopes.
Field flattener lenses in binoculars improve edge sharpness and lower the distortion.
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