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File:Bertele US1988704A (Sonnar f2, 1931).svg

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Summary

Description
English: Dr Ludwig Bertele's Sonnar design (1931), with a maximum aperture of f/2, redrawn from geometry listed in US Patent 1,988,704.
Date
Source Own work
Author Mliu92

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Captions

Dr Ludwig Bertele's ''Sonnar'' design (1931)

Items portrayed in this file

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21 March 2023

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9874bf487c85d9d3c0cb50d2c56af7197e0c6298

1,821 byte

700 pixel

620 pixel

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Date/TimeThumbnailDimensionsUserComment
current14:57, 21 March 2023Thumbnail for version as of 14:57, 21 March 2023620 × 700 (2 KB)Mliu92Uploaded own work with UploadWizard

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