ضوء التنغستن الموجود .. مصدر الضوء .. كيفية التقاط وتطوير الصور الملونة

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  • ضوء التنغستن الموجود .. مصدر الضوء .. كيفية التقاط وتطوير الصور الملونة

    ضوء التنغستن الموجود .. مصدر الضوء .. كيفية التقاط وتطوير الصور الملونة

    EXISTING TUNGSTEN LIGHT

    Tungsten lamps are still the standard type of lighting in most domestic inter- iors , even though fluorescent strip lights are steadily replacing them in larger public areas and offices . Many restaurants also keep tungsten in preference to fluorescent because of the warmer , more friendly atmosphere it creates . The colour temperature depends very much on the wattage of the lamps , and this is usually less than 2900K . So , even on Type B film , domestic tungsten lighting appears yellowish or orange .

    To compensate for this warm cast , you would need a bluish filter in Kodak's 80 series when using Type B film . Either an 80C or 80D filter will give a reasonably neutral result , but with daylight - balanced film you would have to add an 80B on top of this . However , this kind of precision is not necessary ; psychologically , a warm cast to a room is seen by most people to be quite attractive . If you are shooting colour negative film , a considerable degree of correction is possible at the printing stage anyway .

    What is usually more of a problem is the way that tungsten lamps tend to be positioned and used in interiors . More often than not , they are exposed to view rather than concealed ( as most strip lights are used ) . This makes for high contrast , with pools of light , and there is often no way to avoid a bright lamp appearing in shot . The best answer is to choose a viewpoint and composition that either hides a lamp from direct view behind some other object ( such as a pillar or piece of furniture ) or keeps it small in the frame .

    Light levels from domestic tungsten lamps are low , and call for either a slow- to - medium film on a tripod , or a fast film if you want to shoot at speeds that will freeze normal movement and allow you to hold the camera by hand . For example , an average home interior with ISO 64 film would need a setting in the region of 1 / 4sec at f / 2.8 ; with ISO 320 film this could be 1 / 30sec at f / 2 - just acceptable for a handheld shot . Remember that , if you are using a fast daylight- balanced film , adding a blue filter such as an 80B will cost some exposure - about 1/3 stops . To increase the possible shutter speed , uprate the film ; ISO 160 Ektachrome , for example , can be used at ISO 320 if you push - process it by an extra stop .

    RIGHT Tungsten lighting is still the standard illumination for many interiors , and is invariably exposed to view rather than hidden . In this case , the presence of the candelabras has been exploited as a positive advantage .

    BELOW The orange cast resulting from the use of daylight film to record tungsten - lit scenes need not always be unpleasant . As in this example , that orange hue can be used to add warmth to a candid shot .

    ABOVE Light levels from domestic tungsten lamps tend to be low , so it is advisable to use a faster film if camera shake is to be avoided .

    اضغط على الصورة لعرض أكبر. 

الإسم:	CamScanner 11-10-2024 16.16_1.jpg 
مشاهدات:	17 
الحجم:	176.2 كيلوبايت 
الهوية:	240981 اضغط على الصورة لعرض أكبر. 

الإسم:	CamScanner 11-10-2024 16.17_1.jpg 
مشاهدات:	12 
الحجم:	79.8 كيلوبايت 
الهوية:	240982 اضغط على الصورة لعرض أكبر. 

الإسم:	CamScanner 11-10-2024 16.19_1.jpg 
مشاهدات:	13 
الحجم:	132.7 كيلوبايت 
الهوية:	240983 اضغط على الصورة لعرض أكبر. 

الإسم:	CamScanner 11-10-2024 16.19 (1)_1.jpg 
مشاهدات:	12 
الحجم:	116.1 كيلوبايت 
الهوية:	240984 اضغط على الصورة لعرض أكبر. 

الإسم:	CamScanner 11-10-2024 16.21_1.jpg 
مشاهدات:	13 
الحجم:	167.8 كيلوبايت 
الهوية:	240985

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