Velostigmat Wide Angle Ser. III f9.5 | Wollensak
Brief article discusses the design, characteristics and ancestry of Wollensak’s Wide Angle Velostigmat lens and shows an image made with it on an 18 x 24 cm negative.
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The story of Petzval portrait lens
Article addresses the technical and historical aspects of the first lens actually thought, calculated and developed for photography, in 1840 by Joseph Petzval.
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La Lumière | Bernard Maitte
Excellent book on evolution of concepts about light throughout history. All back and forth movements about its corpuscular or wave nature are approached within the cultural context of each moment and the philosophical theological preferences of each scientist. At the end it shows how much science really can not have as purpose an investigation into…
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Pinhole Camera
Homemade pinhole cameras using packaging left overs, woodwork, 3D printing and camera parts. Features also pictures taken with them.
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Enlarger head using LEDs
Article presents project to build a black and white photo enlarger head, with timer, using LEDs and Arduino platform. The result is high power and excellent contrast control for black and white work.
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Using RAW format in photography
Article analyzes a practical case in which the use of RAW file, thanks to its greater depth of color, allows the exploration of areas of a photograph that in format .jpg would be lost.
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Color Depth in digital image files
Article explains why and how color-depth concept is necessary to express the array of different colors a digital system can handle. It clarifies why it must be expressed in bits, what that means in terms of color differentiation, when true-color is reached and why sometimes more than true color becomes highly desirable.
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Landscape Lens | Hermagis
Made in the nineteenth century this lens is a simple achromatic doublet and follows the same constructive principle of the lenses used by Daguerre in his first photographs.
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Eyes wide open – 100 years of Leica Photography | Photo España 2017
Exhibition Review: discusses relationships between the technical features of the legendary Leica camera with aesthetics and new subjects in history of photography.
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Musée Nicéphore Niépce
Review from a visit made in 2017 to the permanent collection with focus on the “Discovery room”, that features the contribution of Niépce to the invention of photography.
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Researches on light in its chemical relations | Robert Hunt
Book published in 1854 devotes the first chapter to the chain of studies that led to the invention of photography. In the remainder of the book the author makes a thorough analysis of light theory, action, and light phenomena, especially photo-chemicals. Can be downloaded in this link.
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Traité de Photographie | N. P. Lerebours
Traité de Photographie | N. P. Lerebours This is the fourth edition, June 1843, so soon after the release of the Daguerreotype process in 1839. It is really a manual for those who want to start in photography, covering topics from exposure time, plate size and optical considerations, up to the processing of the silvered…
