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 #:
000161
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 129 that all views taken with a lens of 4" focal length will be equally satisfactory. Telephoto Lenses. — Sometimes it is impossible to get sufficiently near an object, such as some piece of architecture, in order to obtain a good detailed picture of it with an ordinary R. R. lens. Or it may be that it is found that some distant objects, when looked at on the focussing screen, appear much too small to be of use in a photograph. Then it is that a telephoto attachment becomes of use. The diagram (47) shows a rapid rectilinear lens with a back telephoto attachment. Fig. 47. In most cases the negative back attachment used is one having a focal length of about half that of the positive lens to which it is attached. It is necessary to explain here that the actual distance between the lens and the screen is usually referred to as " the back focal length " when speaking of telephoto lenses ; the term, equivalent focal length, has already been explained (see p. 118). It ought to be remembered, when taking a distant view by means of a lens with a telephoto attachment, that a hazy atmosphere will render the photograph somewhat indistinct, and it is therefore best to choose a clear and not over-hot day for such work ; even then it will be i