تويت
ضوء الشمس - ١ - مصدر الضوء .. كيفية التقاط وتطوير الصور بالأبيض والأسود
THE LIGHT SOURCE
SUNLIGHT
Daylight is the richest and most varied illumination available for photography , as well as being the most common . One of the most important steps in learning photography is an appreciation of the role that lighting plays . The technical side of light and exposure is actually fairly straightforward , much more signifi- cant is the quality of the light - this can make or break a photograph . The more you know about the causes and effects of the many conditions of natural light , the better equipped you will be to use it .
The two basic factors that control the quality of daylight are the position of the sun in the sky and the atmospheric conditions , like cloud and haze , which diffuse it . The height of the sun above the horizon determines the brightness , and also the texture and contrast of surfaces . The colour temperature depends on this as well , but for black - and - white photography this is not a considera- tion . As it rises in the morning , the light passes through less atmosphere than when the sun is low , so that in the middle of a typically bright , clear day in summer in middle latitudes , the exposure on ISO125 film would need to be somewhere in the region of 1 / 125sec at f / 16 . This is the basis of a useful expos- ure principle for the occasions when your light meter has broken down or its batteries failed : for bright , sunny weather , use an exposure setting equivalent to 1 / ISO film speed at f / 16 . With no clouds , this holds true between mid- morning and mid - afternoon in summer .
ABOVE Strong overhead sunlight produces deep shadows in photographs which can be highly unattractive in portraiture , but can add both depth and atmosphere to architectural pictures such as the one shown here .
ABOVE RIGHT The simplest solution to the problems of shadows in sunny conditions is to move your subjects into the shade , where the light is softer . Because you are working with black - and - white film , you have no worries about the slight colour cast that appears when using certain colour emulsions .
Natural Light Conditions
THE LIGHT SOURCE
SUNLIGHT
Daylight is the richest and most varied illumination available for photography , as well as being the most common . One of the most important steps in learning photography is an appreciation of the role that lighting plays . The technical side of light and exposure is actually fairly straightforward , much more signifi- cant is the quality of the light - this can make or break a photograph . The more you know about the causes and effects of the many conditions of natural light , the better equipped you will be to use it .
The two basic factors that control the quality of daylight are the position of the sun in the sky and the atmospheric conditions , like cloud and haze , which diffuse it . The height of the sun above the horizon determines the brightness , and also the texture and contrast of surfaces . The colour temperature depends on this as well , but for black - and - white photography this is not a considera- tion . As it rises in the morning , the light passes through less atmosphere than when the sun is low , so that in the middle of a typically bright , clear day in summer in middle latitudes , the exposure on ISO125 film would need to be somewhere in the region of 1 / 125sec at f / 16 . This is the basis of a useful expos- ure principle for the occasions when your light meter has broken down or its batteries failed : for bright , sunny weather , use an exposure setting equivalent to 1 / ISO film speed at f / 16 . With no clouds , this holds true between mid- morning and mid - afternoon in summer .
ABOVE Strong overhead sunlight produces deep shadows in photographs which can be highly unattractive in portraiture , but can add both depth and atmosphere to architectural pictures such as the one shown here .
ABOVE RIGHT The simplest solution to the problems of shadows in sunny conditions is to move your subjects into the shade , where the light is softer . Because you are working with black - and - white film , you have no worries about the slight colour cast that appears when using certain colour emulsions .
Natural Light Conditions
تعليق