إضاءة التنغستن .. الإضاءة .. كتاب التصوير الفوتوغرافي المغلق

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  • إضاءة التنغستن .. الإضاءة .. كتاب التصوير الفوتوغرافي المغلق

    إضاءة التنغستن ..
    الإضاءة ..
    كتاب التصوير الفوتوغرافي المغلق

    Tungsten lighting

    Continuous lighting is useful for studio photo graphy of stationary close - up subjects because the effects of light and shadow can be viewed directly through the camera . Photofloods with large reflectors are not ideal for precise close up illumination , since they light too large an area . A wide beam can be concentrated by a snoot -a funnel - like attachment for producing a narrow directional beam . Snoots can be made quite simply from an open - ended cone of black paper .

    I use a variety of tungsten lights in my studio , not all from photographic suppliers . They include microscopic lamps , each with a variable diaphragm ( see p . 156 ) and a variable light out put , anglepoise lamps , tungsten halogen spot lights , household reflector bulbs , photographic light boxes and fiber optics ( see p . 52 ) .
    One disadvantage of using lights not specifically designed for photography is that they may not have the right color temperature to give the correct color balance with color filmstock . For instance , low wattage ( 40-60W ) household bulbs have a much lower color temperature than the studio floods which are balanced for use with tungsten light films . Therefore , unless blue filters ( 82B and 82C ) are placed over the lens , color pictures lit with household bulbs will have a reddish cast .

    Powerful tungsten lights give off considerable heat which may result in delicate natural specimens drying out or wilting . Direct heat from such bulbs can be reduced by placing a special heat - absorbing glass filter or a clear glass aquarium filled with water between the light and the subject .

    Still life
    I arranged the fruit , nuts and lighting so that the final effect resembled a painting . The polished top of an antique sewing table was chosen to reflect the base of the glass and the nuts . From the left I directed a pair of tungsten spotlights through a large sheet of tracing paper ; this softened the highlights in the fruit . I shone a third spotlight onto a Lastolite reflector ( see p . 152 ) on the right to fill in the shadows , while a single fiber optic gave tiny catchlights to the red cherries , helping to separate them from the black velvet background . Lens Hasselblad 150mm + 32mm extension Mag , on film × 0.25 Mag , on page × 0.6

    Lighting coins I took this mint Seychelles coin using axial lighting by shining a microscope spotlight onto a piece of glass at 45 , as shown in the set - up on the right . This molded the relief of the orchid flower design on the coin , which was based on one of my photographs . I eliminated reflections in the glass by using a matte black mask ( see p . 124 ) . Lens Hasselblad 80mm + 55mm extension Mag . on film × 0.7 Mag . on page × 2

    Watermark
    This distinctive bull's - head watermark was present on a sheet of hand - made paper . I placed the paper on a lightbox and took the picture simply by metering the light passing through the paper . A watermark can also be photographed by available light by attaching the paper to a window , or by flash or floodlight by scotch taping the paper to a piece of vertical glass . Lens Hasselblad 80mm + 42mm ( 21 + 21 ) extension Mag . on film × 0.6 Mag . on page × 1

    A glowing bulb
    For this picture of an internal glowing filament , I used a 40 - watt electric light bulb , connected to a dimmer switch . The bulb and dimmer were placed in front of a black velvet backcloth and I used a microscope lamp ( as in the set - up above ) to highlight the outline . Lens Hasselblad 80mm + 37mm ( 21 + 16 ) extension Mag . on film x0.5 Mag . on page × 1.6

    Bony sutures
    A single spotlight covered with a white diffuser was used to light the top of a red deer skull , showing clearly the convoluted junctions of the skull plates . Lens Hasselblad 80mm + 42mm ( 21 + 21 ) extension Mag . on film x0.5 Mag . on page × 1

    اضغط على الصورة لعرض أكبر. 

الإسم:	1696868224205.jpg 
مشاهدات:	21 
الحجم:	248.5 كيلوبايت 
الهوية:	168029 اضغط على الصورة لعرض أكبر. 

الإسم:	1696868224188.jpg 
مشاهدات:	15 
الحجم:	90.2 كيلوبايت 
الهوية:	168030 اضغط على الصورة لعرض أكبر. 

الإسم:	1696868224169.jpg 
مشاهدات:	15 
الحجم:	96.3 كيلوبايت 
الهوية:	168031 اضغط على الصورة لعرض أكبر. 

الإسم:	1696868224154.jpg 
مشاهدات:	14 
الحجم:	131.5 كيلوبايت 
الهوية:	168032 اضغط على الصورة لعرض أكبر. 

الإسم:	1696868224138.jpg 
مشاهدات:	14 
الحجم:	101.1 كيلوبايت 
الهوية:	168033

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