Lens description with photos, measurements and presence in a manufacturer’s catalog. Photographs of pencil inscriptions on the edge of optical elements and details of the standard carte-album format, popular in the late nineteenth and early twentieth centuries, to which this lens was intended.
A short text, with photos, analyzes a portrait lens constructed by Derogy-France, based on the famous drawing by Josef Petzval of 1840. It briefly discusses, from this manufacturer, how the Industrial Revolution impacted the optical industry in 19th the century.
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.
Article addresses the technical and historical aspects of the first lens actually thought, calculated and developed for photography, in 1840 by Joseph Petzval.
Homemade pinhole cameras using packaging left overs, woodwork, 3D printing and camera parts. Features also pictures taken with them.
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.
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.
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.
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.
Exhibition Review: discusses relationships between the technical features of the legendary Leica camera with aesthetics and new subjects in history of photography.
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.
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.