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الفلاش الحلقي ..
الإضاءة ..
كتاب التصوير الفوتوغرافي المغلق
Ring flash
Ring flashes are usually separate flash units designed to fit like a collar around the camera lens . Most models consist of a circular tube covered with a diffusing screen , but one unit , known as a Texturelite , has four separate flashes arranged in a square unit around the lens . It is possible to make your own ring flash by setting up three or four small flash guns on a bracket around the lens .
flash Ring flashes provide front , shadowless , axial lighting without generating much heat . They are quick and convenient to use , particularly when you require a large number of exposures of similar - sized close - up subjects . Front lighting may be the only way of lighting recessed spaces . This is why their primary use is for medical , dental and scientific photography . Some modeling can be achieved with a ring flash by masking off portions with black paper or tape . I also use a ring flash remote from the lens to produce transmitted lighting by placing it beneath an active translucent subject .
There are now many ring flash units available for 35mm SLR camera systems . Larger models for medium format cameras include the Hasselblad ringlight and the Quadmatic Ring lite , which has a 5 - inch internal and a 15 - inch external diameter .
A few specialized lenses have their own built - in ring flash ( see p . 47 ) as an integral part of the lens . These lenses , although marketed as medical lenses , can be used for a variety of close - ups . The Medical - Nikkor has an optional data button which , when depressed , auto matically imprints the magnification on to the film for easy reference .
Macro ringlight SM - 2 A This ring flash has a bayonet mount which connects to the back of the lens when it is mounted on the camera in the reverse position . The flash , which can be powered by either a unit run off electricity ( shown above ) or one powered by batteries , can be used at full power or at quarter power . There is also a built - in focusing light .
The heart of a flower ▷ Most orchids have deep throated flowers which are difficult to light when a flash is used remote from the camera . I placed this flower in a vase and secured the stem with a piece of modeling clay pushed into the narrow neck of the vase . I reversed the macro lens on the camera body , before attaching a ring flash to the back of the lens . After viewing the orchid with the built - in modeling light , I decided to mask one part of the ring flash with black paper . Lens 55mm micro - Nikkor ( reversed ) Mag . on film × 0.8 Mag . on page × 4.8
Medical - Nikkor 120mm f4 1FA This special macro lens has a built - in ring flash . Once the film speed has been selected , the correct aperture is automatically set as the lens is focused , since the diaphragm and focusing ring are coupled
Convoluted kernel A I placed this walnut kernel in an upright position beneath the camera by pressing it down onto a small piece of modeling clay . The camera was roughly focused by winding it down the support column of the overhead copying stand , and critically focused by moving it on a focusing slide . I decided to use a ring flash so that the recessed parts of the walnut would be illuminated . Lens 55mm micro - Nikkor ( reversed ) + 27.5mm extension Mag . on film x0.75 Mag . on page x3
Eyeball ▷ I used a medical Nikkor lens with its own built - in ring flash to light my husband's eye . The back of his head was well supported in an upright chair . I hand - held the lens , checking the focus with the built - in modeling light . Notice the almost circular reflection of the ring flash in the dark central pupil . I took this picture as a horizontal format to include the whole eye ; only the central portion is reproduced here . Lens 120mm Medical - Nikkor Mag . on film × 0.5 Mag . on page × 5.5
الإضاءة ..
كتاب التصوير الفوتوغرافي المغلق
Ring flash
Ring flashes are usually separate flash units designed to fit like a collar around the camera lens . Most models consist of a circular tube covered with a diffusing screen , but one unit , known as a Texturelite , has four separate flashes arranged in a square unit around the lens . It is possible to make your own ring flash by setting up three or four small flash guns on a bracket around the lens .
flash Ring flashes provide front , shadowless , axial lighting without generating much heat . They are quick and convenient to use , particularly when you require a large number of exposures of similar - sized close - up subjects . Front lighting may be the only way of lighting recessed spaces . This is why their primary use is for medical , dental and scientific photography . Some modeling can be achieved with a ring flash by masking off portions with black paper or tape . I also use a ring flash remote from the lens to produce transmitted lighting by placing it beneath an active translucent subject .
There are now many ring flash units available for 35mm SLR camera systems . Larger models for medium format cameras include the Hasselblad ringlight and the Quadmatic Ring lite , which has a 5 - inch internal and a 15 - inch external diameter .
A few specialized lenses have their own built - in ring flash ( see p . 47 ) as an integral part of the lens . These lenses , although marketed as medical lenses , can be used for a variety of close - ups . The Medical - Nikkor has an optional data button which , when depressed , auto matically imprints the magnification on to the film for easy reference .
Macro ringlight SM - 2 A This ring flash has a bayonet mount which connects to the back of the lens when it is mounted on the camera in the reverse position . The flash , which can be powered by either a unit run off electricity ( shown above ) or one powered by batteries , can be used at full power or at quarter power . There is also a built - in focusing light .
The heart of a flower ▷ Most orchids have deep throated flowers which are difficult to light when a flash is used remote from the camera . I placed this flower in a vase and secured the stem with a piece of modeling clay pushed into the narrow neck of the vase . I reversed the macro lens on the camera body , before attaching a ring flash to the back of the lens . After viewing the orchid with the built - in modeling light , I decided to mask one part of the ring flash with black paper . Lens 55mm micro - Nikkor ( reversed ) Mag . on film × 0.8 Mag . on page × 4.8
Medical - Nikkor 120mm f4 1FA This special macro lens has a built - in ring flash . Once the film speed has been selected , the correct aperture is automatically set as the lens is focused , since the diaphragm and focusing ring are coupled
Convoluted kernel A I placed this walnut kernel in an upright position beneath the camera by pressing it down onto a small piece of modeling clay . The camera was roughly focused by winding it down the support column of the overhead copying stand , and critically focused by moving it on a focusing slide . I decided to use a ring flash so that the recessed parts of the walnut would be illuminated . Lens 55mm micro - Nikkor ( reversed ) + 27.5mm extension Mag . on film x0.75 Mag . on page x3
Eyeball ▷ I used a medical Nikkor lens with its own built - in ring flash to light my husband's eye . The back of his head was well supported in an upright chair . I hand - held the lens , checking the focus with the built - in modeling light . Notice the almost circular reflection of the ring flash in the dark central pupil . I took this picture as a horizontal format to include the whole eye ; only the central portion is reproduced here . Lens 120mm Medical - Nikkor Mag . on film × 0.5 Mag . on page × 5.5
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