 |
|
Kinematograph Studio Technique; A Practical Outline of the Artistic and Technical Work in the Production of Film Plays, for Producers, Camera-men, ... of Entering the Kinematograph Industry
L. C. Macbean
Paperback. RareBooksClub.com 2013-09-13.
ISBN 9781230072685
|
|
|
|
Hitta bokens lägsta pris
|
Förlagets beskrivning
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...passing the lens, hence the inversion of an image on the focusing screen or plate in the camera. Refractive Powers of Different Media. It is very important to note that the degree to which a beam of light is bent varies with the density of the refracting medium. Water has much greater power in this respect than air; crown glass has higher refractive power than water; and flint glass has yet greater refractive properties than crown glass. Chromatic Aberration. It has been stated that rays of some colours are refracted to a greater extent than others. In Fig. 20 a beam of white light (W) is shown refracted and decomposed, (or its rays dispersed) by a lens. It will be seen FIG. 20.-CHRCMATIC ABERRATION. The distances between the foci for different colours-are exaggerated. that the various foci are in different planes; in other words the coloured rays come to a focus at unequal distances from the lens, and if a sharp image be formed by focusing the yellowish-green FIG. 21. FIG. 22.-FIG. 23. FIG. 24. BI-coNvEx PLANO-MENIscUs ACHROMATIC LENs. c0NvEx LENS LENs. LENs. rays (to which the eye is most sensitive) there ' are subsidiary out-of-focus images formed by the other colours. In particular the violet and ultraviolet images (to which the silver salt is most sensitive) are appreciably out of focus. This is known as "chromatic aberration." In a modern photographic lens this defect is practically eliminated by " compounding" the lens by the use of more than one kind of glass, the components being cemented together into optical contact. Such a lens is known as " achromatic, " and one form is shown in Fig. 24. Spherical Aberration. Those rays which pass through the outer parts of a lens (Fig. 25) come to a focus
Liknande böcker
Recensioner
Den här boken har tyvärr inte några recensioner ännu. Om du redan läst boken, skriv en recension!
Recensera boken
Skriv en recension och dela dina åsikter med andra. Försök att fokusera på bokens innehåll. Läs våra instruktioner för mer information.
Kinematograph Studio Technique; A Practical Outline of the Artistic and Technical Work in the Production of Film Plays, for Producers, Camera-men, ... of Entering the Kinematograph Industry
Bokrecensioner » Kinematograph Studio Technique; A Practical Outline of the Artistic and Technical Work in the Production of Film Plays, for Producers, Camera-men, ... of Entering the Kinematograph Industry
|
|
 |
|
|
|
|
