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Excerpt from Telephotography: An Elementary Treatise on the Construction and Application of the Telephotographic Lens This treatise is addressed to those who practise photography either for pictorial or scientific ends. The late Michael Faraday once remarked: "Lectures which really teach will never be popular; lectures which are popular will never teach." All writers must experience the same inherent difficulty of treating scientific matter in any but an academic style. The author has endeavoured to present the subject of Telephotography in a manner which presupposes only the very slightest acquaintance with the science of Optics, explaining fully only those few properties or functions of lenses, which are necessary to enable the photographer to understand the action of the Telephotographic lens, and to comprehend the wide possibilities of its applications. The aim of the present work, in short, has been to call attention to the scale in which objects are reproduced in the image by ordinary photographic lenses, and to show how this image may be subjected to direct enlargement or magnification before it is received on the photographic plate. This method was adopted by the author in his original contributions to the subject. It is perhaps less classical than treating the instrument as a complete optical system, but has a more practical bearing upon its use; and as might be expected, is more readily grasped by those who are acquainted with the action of ordinary photographic lenses: both methods are, however, included. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works
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Telephotography
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