Literature: Optics and Lenses, English Books, 1901 onwards
1) C. Welborne Piper, A First Book of the Lens, c. 1901. – 2) Thomas Bolas and George E. Brown, The Lens, 1902. – 3–4) Photographic Lenses. A Simple Treatise, 1904. – 5) Arthur Lockett, Camera Lenses, 1928. – And: 6–11) Optics, telephotography etc. – In addition: Illustrated Guide Photographic Inter-Lens Shutters, 1917.

Literatur: Optik und Objektiv, englisch sprachig, ab 1901
1) C. Welborne Piper, A First Book of the Lens, um 1901. – 2) Thomas Bolas and George E. Brown, The Lens, 1902. – 3–4) Photographic Lenses. A Simple Treatise, 1904. – 5) Arthur Lockett, Camera Lenses, 1928. – Und: 6–11) Optics, Telephotography etc. – Dabei: Illustrated Guide Photographic Inter-Lens Shutters, 1917.

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