Author: Francis E. WasherPublisher: Forgotten Books
ISBN: 9780282878337
Category : Science
Languages : en
Pages : 40
Book Description
Excerpt from Method for Determining the Resolving Power of Photographic Lenses This publication supersedes nbs Circular _533, issued May 20, 1953. It contains the original data and a new appendix describing the nbs Microcopy Resolution Test Charts No. Loloa. It provides the photographer with two sets of charts by which the resolving' power of a photographic lens may be numerically measured with respect to a definite scale of values. A detailed description is given of the procedure and technique to be followed in order that comparable values may be obtained by different observers. The test provides an objective method of testing a photographic lens. The six charts of one set are printed in black ink on a white background to form a high-contrast chart. The six charts of the other set are printed with gray ink on a gray background to form a low - contrast chart. Additional uses of these charts are also described. These uses include the testing of goggle lenses for definition and prismatic power and the testing of telescopes and binoculars for definition. Key words: Photographic lenses; resolution test charts; resolving power. 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.
