Photo-Era Volume 44 by Photographers' Club of New England
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Author: Photographers' Club of New England
Number of Pages: 210 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130144239
Download Link: Photo-Era Volume 44
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ... the inventor and patentee of the Graf Vicar Super-Anastigmat, which took the experience of a lifetime to develop. Possibly, one of Mr. Graf's greatest achievements was the designing and making of the first F/4.5 anastigmat lens, using American glass exclusively. This was done for the Bureau of Standards, United States Government, after the United States went into war with Germany, and imported glass was no longer available. Anastigmat lenses of American glass for the Photographic Section of the United States Air Service were of the utmost necessity, and Mr. Graf met this need. His formulas were accepted and all lenses made for this most important branch of the United States Army were made upon his specifications. Graf Vicar Super-Anastigmat Lenses are being made in speeds of F/8.5 for motion-picture Cameras F/4.5, F/5.5, F/0.8, F/7.7 for general photographic purposes, F/8, and F/9 for photo-engravers, diffusing-lenses F/4.5 and F/5.5 for portraiture and enlarging. A cemented lens of six elements, similar in construction to the Dagor, speed F/6.8, is also being made. Transposing Lenses Whether there is a difference in focal length if the single combination is placed before or behind the diaphragm-stop, is discussed helpfully in The Amateur Photographer. A great many of the anastigmats and rectilinears in use are composed of two more or less identical combinations, one on each side of the central stop; and, as everyone knows, lenses of such a kind are said to be symmetrical. With such instruments, it does not make any appreciable difference which of the two combinations is in front, except in one respect, but that is one which in certain cases is very important. Although nominally these two combinations may be of the same focal length, actually the foci can ...
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