افلام اور فوکلور .. كتاب التصوير الملون ، الكاتب عبد الفتاح رياض

Chapter Seven

Definition of common color film properties and methods of displaying them

It is common in the Arab countries to use multiple types of color films, whether for cinematography or still photography, so we find that it is feasible to devote a section in this book to studying the characteristics of these films and all that the photographer needs to know about them such as the speed of their sensitivity, the appropriate color temperature of the rays, filters Optical lenses required for imaging in different conditions, exposure steps, and solution compositions whenever possible. Such information is guaranteed to assist the photographer when he thinks about choosing the appropriate film for his purpose, or to guide him on what is needed for filming a specific film that he actually obtained.

(1) Folklore films First: color negative films

For still photography

Orfo film factories produce the following color negative films:

(1) ORWOCOLOR Negative Film NC 17 Mask. We will talk about its characteristics and ways of showing it in detail in this section (pg. 219).

ORWOCOLOR Negative film NK 16, (b) It is a film prepared for filming in the light of tungsten lamps and photospheres, or with clear flash bulbs, or reddish-yellowish, and its sensitivity is DIN 1. It may be used for shooting in daylight with a filter of 14 Orwocolor k, and then the exposure is estimated as a film with a sensitivity of 15 DIN, because the factor of this filter = 1.3) Please refer to Table No. 9 on page 69, and the steps for showing this film differ from what is usual for films the other negative. It can be obtained in the form of a roll film with a reel of size 120.

. (1) Mr. Horst Eilhardt, the chemical engineer, the technical consultant for the Orpho film factories in the United Arab Republic, kindly assisted us in obtaining the latest data related to the properties of the Orfo films, methods of showing them, and the composition of the display solutions that came in this book. As for the films, Orfo Color, the symbols that make up the name of the film indicate the following: A color film prepared for filming in daylight Tageslicht T

Industrial Kunstlicht » » = K D D D As for numbers such as 16, 18, 13, they indicate the speed of sensitivity estimated in DIN color unit = 9 ? Color

= N U = Reversal movie is negative.

ORWOCOLOR Negative Film NT 18,

It is the heat of its color with its rays. Film intended for shooting in daylight or the light of other light sources that expend the degree of daylight, such as blue flash lamps, electronic flashlights or daylight fluorescent tubes

Its sensitivity is 18 DIN

he . A film similar to the previous one in terms of its sensitivity (DIN 18), except that it was prepared for filming in the light of tungsten lamps and photofloods, or with transparent flashlight lamps or light sources with reddish rays with yellowness.

(D) 18 ORWOCOLOR Negative film NK

The methods of displaying the two films 618, 18 NT are consistent and their sizes are consistent, and they are made as 35 mm Miniature films (36 or photo) or as roll films (size 20).

Reels 127, 120, 620) or as flat films according to the usual standards starting from 6.5 9 cm to 240 300 cm.