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الغسق والفجر .. مصدر الضوء .. كيفية التقاط وتطوير الصور الملونة
DUSK & DAWN
Some of the most interesting and dramatic lighting effects come from shooting before sunrise and after sunset . The low level of the light needs some obvious precautions - a tripod and cable release are standard equipment - but the delicate light can be a useful alternative for subjects that would otherwise be uninteresting in ordinary sunlight .
One of the most reliable ways of using twilight is to shoot against it , silhou- etting subjects against the brightest area of the sky . With this technique , expose for the sky rather than the silhouetted objects in order to keep the colours rich and saturated . For safety , it is a good idea to bracket exposures ( see page 77 ) .
A variation of this silhouette approach is to photograph reflected twilight . With a slightly raised camera position , such as from a bridge , the water in a lake or river will reflect the sky , and if the weather conditions are right , this will give a broad , smooth background . Shiny , reflective subjects benefit from this treat- ment as well .
The lighting conditions at dusk and dawn change rapidly - far faster than you might notice at the time . Keep a careful eye on the exposure meter because the level can change within minutes . When the sun is far below the horizon , exposure times are likely to be long , running into several minutes . Reciprocity failure comes into play and introduces some uncertainty in the exposure set- ting , and even if you have the film manufacturer's tables for compensation ( these are rarely included with the film , and usually come in a separate leaflet ) , bracket the exposures widely . The colour shift in a twilit landscape view may not be too serious ; the colours are in any case likely to be unusual .
BELOW Keep in mind when shooting at either dusk or dawn that lighting conditions change quickly . If taking a series of shots , continually check the camera's meter : readings can change quicker than you might imagine .
ABOVE Shooting against twilight is a reliable technique , silhouetting subjects against the brightest areas of the sky To achieve this , expose for the sky rather than the subject and bracket exposutes to be sure of a good shot .
LEFT A technique that works at either dusk or dawn is to use the reflected light on the surface of a river or lake in this case , the photo was taken at dawn from at reasonably high viewpoint .
DUSK & DAWN
Some of the most interesting and dramatic lighting effects come from shooting before sunrise and after sunset . The low level of the light needs some obvious precautions - a tripod and cable release are standard equipment - but the delicate light can be a useful alternative for subjects that would otherwise be uninteresting in ordinary sunlight .
One of the most reliable ways of using twilight is to shoot against it , silhou- etting subjects against the brightest area of the sky . With this technique , expose for the sky rather than the silhouetted objects in order to keep the colours rich and saturated . For safety , it is a good idea to bracket exposures ( see page 77 ) .
A variation of this silhouette approach is to photograph reflected twilight . With a slightly raised camera position , such as from a bridge , the water in a lake or river will reflect the sky , and if the weather conditions are right , this will give a broad , smooth background . Shiny , reflective subjects benefit from this treat- ment as well .
The lighting conditions at dusk and dawn change rapidly - far faster than you might notice at the time . Keep a careful eye on the exposure meter because the level can change within minutes . When the sun is far below the horizon , exposure times are likely to be long , running into several minutes . Reciprocity failure comes into play and introduces some uncertainty in the exposure set- ting , and even if you have the film manufacturer's tables for compensation ( these are rarely included with the film , and usually come in a separate leaflet ) , bracket the exposures widely . The colour shift in a twilit landscape view may not be too serious ; the colours are in any case likely to be unusual .
BELOW Keep in mind when shooting at either dusk or dawn that lighting conditions change quickly . If taking a series of shots , continually check the camera's meter : readings can change quicker than you might imagine .
ABOVE Shooting against twilight is a reliable technique , silhouetting subjects against the brightest areas of the sky To achieve this , expose for the sky rather than the subject and bracket exposutes to be sure of a good shot .
LEFT A technique that works at either dusk or dawn is to use the reflected light on the surface of a river or lake in this case , the photo was taken at dawn from at reasonably high viewpoint .
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