تويت
زجاج الإضاءة ..
التأثير البشري ..
كتاب التصوير الفوتوغرافي المغلق
Lighting glass
Glass is not an easy material to illuminate since it both reflects and refracts light . Clear glass can be photographed either against a white background so that the outline is sil houetted , or against a black background so that it is outlined in white . If clear glassware is lit directly it will reflect any nearby object . Professional studios light glass indirectly by placing the glass on a curved light table made from a single sheet of Plexiglass which is flexible , white and opaque . The lights are then shone either from beneath the glassware or behind it . A cheaper version of this set - up can be made by using a piece of glass and a large sheet of translucent acetate sheeting as shown in the diagram on this page .
A black background has to be placed well behind the glass to allow space for the light sources to be angled in at 45 ° . White card placed on each side in front of the glass will emphasize the white outline . A technique used to display cut and engraved glassware in department stores can also be used for photo graphy . The glass is lit from below by position ing it over holes in a shelf which is covered with black velvet . Engraved glass can also be lit by " painting " with light . This involves moving a continuous light source up and down during a long exposure . Surroundings can be deliber ately reflected in a smooth wide - based brandy glass by lining the glass with black paper . When using color film to photograph clear glass , you can create additional interest by means of colored lights , colored liquid , or an object such as a flower ( see p . 14 ) . The full impact of colored glass is gained only when it is lit from behind so that it glows .
Highlighting hop flowers
I took this glass beer mug etched with hop flowers by grazing a single fiber optic down from the top of the mug . Lens Hasselblad 80mm + 32mm extension Mag . on film x0.5 Mag . on page × 1.5
Effective perspective
I supported a piece of glass measuring 12 inches square on two supports , making sure they did not appear in the field of view . Then I arranged a large sheet of white translucent acetate paper so that it lay flush on the glass . By bending it through a gentle curve , it formed a continuous backcloth . I then placed four liqueur glasses in a row on the center horizontal part of the sheet . A single Multiblitz Minilite 200 , with a diffusing screen , was attached to a baby Benbo tripod as shown in the set up above , so that it illuminated the glasses from behind . In this way the dark outline of the glasses stands out clearly against the white background . So much light was reaching the film that even when the lens was fully stopped down , I had to use a neutral density filter to get the correct exposure . Lens Hasselblad 80mm + 21mm extension Mag . on film * 0.25 Mag . on page × 1.25
Bottom lighting
I raised this glass paperweight on a photo jack ( see p . 152 ) so I could position a fiber optic beneath it . I inserted a piece of black velvet with.a hole cut out for the light to pass through between the paperweight and the light source . This provided a dramatic backcloth . Lens Hasselblad 80mm + 16mm extension Mag . on film × 0.3 Mag , on page x2
Patterned glass ▷ Pictures of patterned glass , which is textured to obscure vision , can be made quite simply by means of a photogram ( see p . 72 ) . I placed a piece of printing paper beneath a glass with a daisy pattern and exposed it with the enlarger lamp . Mag . on print × 1 Mag . on page × 0.65
التأثير البشري ..
كتاب التصوير الفوتوغرافي المغلق
Lighting glass
Glass is not an easy material to illuminate since it both reflects and refracts light . Clear glass can be photographed either against a white background so that the outline is sil houetted , or against a black background so that it is outlined in white . If clear glassware is lit directly it will reflect any nearby object . Professional studios light glass indirectly by placing the glass on a curved light table made from a single sheet of Plexiglass which is flexible , white and opaque . The lights are then shone either from beneath the glassware or behind it . A cheaper version of this set - up can be made by using a piece of glass and a large sheet of translucent acetate sheeting as shown in the diagram on this page .
A black background has to be placed well behind the glass to allow space for the light sources to be angled in at 45 ° . White card placed on each side in front of the glass will emphasize the white outline . A technique used to display cut and engraved glassware in department stores can also be used for photo graphy . The glass is lit from below by position ing it over holes in a shelf which is covered with black velvet . Engraved glass can also be lit by " painting " with light . This involves moving a continuous light source up and down during a long exposure . Surroundings can be deliber ately reflected in a smooth wide - based brandy glass by lining the glass with black paper . When using color film to photograph clear glass , you can create additional interest by means of colored lights , colored liquid , or an object such as a flower ( see p . 14 ) . The full impact of colored glass is gained only when it is lit from behind so that it glows .
Highlighting hop flowers
I took this glass beer mug etched with hop flowers by grazing a single fiber optic down from the top of the mug . Lens Hasselblad 80mm + 32mm extension Mag . on film x0.5 Mag . on page × 1.5
Effective perspective
I supported a piece of glass measuring 12 inches square on two supports , making sure they did not appear in the field of view . Then I arranged a large sheet of white translucent acetate paper so that it lay flush on the glass . By bending it through a gentle curve , it formed a continuous backcloth . I then placed four liqueur glasses in a row on the center horizontal part of the sheet . A single Multiblitz Minilite 200 , with a diffusing screen , was attached to a baby Benbo tripod as shown in the set up above , so that it illuminated the glasses from behind . In this way the dark outline of the glasses stands out clearly against the white background . So much light was reaching the film that even when the lens was fully stopped down , I had to use a neutral density filter to get the correct exposure . Lens Hasselblad 80mm + 21mm extension Mag . on film * 0.25 Mag . on page × 1.25
Bottom lighting
I raised this glass paperweight on a photo jack ( see p . 152 ) so I could position a fiber optic beneath it . I inserted a piece of black velvet with.a hole cut out for the light to pass through between the paperweight and the light source . This provided a dramatic backcloth . Lens Hasselblad 80mm + 16mm extension Mag . on film × 0.3 Mag , on page x2
Patterned glass ▷ Pictures of patterned glass , which is textured to obscure vision , can be made quite simply by means of a photogram ( see p . 72 ) . I placed a piece of printing paper beneath a glass with a daisy pattern and exposed it with the enlarger lamp . Mag . on print × 1 Mag . on page × 0.65
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