The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
000163
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 02, 2024
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LENSES 131 and weight is likely to be of great use when large camera extensions are used in ordinary landscape views. The new Adon requires about 8" camera extension for infinity, is of 20" focal length, and works at //10. The correct exposure may be ascertained by the ordinary rules for any lens working at //10. Attach the lens to the camera and rotate the front cell to the right until the line engraved infinity on the inner tube is exactly opposite the arrow on the outer tube. This adjustment should not again be touched, focussing LARGE PICTURES ON SMALL CAMERAS Fig. 47a. being effected by the rack and pinion on the camera. On fixed extension cameras, focussing may be effected by the spiral adjustment on the Adon. It is, however, preferable to focus by the camera. The Busch " Bis Telar " is another lens which can be used by itself as a tele-objective. The diagram (48) shows the construction of this lens, which is made in five different sizes, having focal lengths from 8" to 22" inclusive, while the camera extensions required for objects at infinity range only from 4£* to 11 J" respectively.