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Answer for the clue "Compound lens or lens system designed to be free of astigmatism and able to form approximately point images ", 10 letters:
anastigmat

Word definitions for anastigmat in dictionaries

WordNet Word definitions in WordNet
n. compound lens or lens system designed to be free of astigmatism and able to form approximately point images

Wikipedia Word definitions in Wikipedia
For the astigmatism correction of electron beams see Stigmator . An anastigmat or anastigmatic lens is a photographic lens completely corrected for spherical aberration , coma , and astigmatism . Early lenses often included the word Anastigmat in their ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
anastigmat \anastigmat\ n. 1. compound lens or lens system designed to be free of astigmatism and able to form approximately point images.

Wiktionary Word definitions in Wiktionary
n. (context photography English) An anastigmatic lens.