A complete treatise on the art of retouching photographic negatives, and clear directions how to finish & colour photographs (1886)
Johnson, Robert (Writer on photography), author · London : Marion and Co. · leaf 128
HE SWING MOVEMENTS, yet no complicated mechanism. GREAT LENGTH OF FOCUS, yet can be reduced for the shortest focus of lenses. Fig. I. represents the Camera at its greatest extension and placed upon the tripod ; a glance will show that the arrange- ment of struts is such as to secure the rigidity of… … exact centre is also obtainable in a moment by a reference to marks which are placed on the front of Camera. Short and Long Focus. — While Fig. I. shows that the Camera is capable of use with a single lens (long focus), Fig. III. shows that the back of Camera can be advanced so as to allow the use…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
