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المنظور .. معدات وتقنيات إضافية .. المرشد خطوة بخطوة للتصوير الفوتوغرافي
Perspective
Another important effect of using different lenses is the way they help you to alter the linear perspective in your pictures . The eye judges distance by the way objects diminish in size , and the angle at which lines and planes converge . This is what we mean by linear perspective . Using the right combina- tion of camera distance and lens you can make the whole picture look deep or shallow , as shown in the three pictures , right . The feeling of increased or reduced depth is purely illusory , but is an important compositional technique , ( see pp . 114-15 ) . You can , for example , use steep convergence of lines or planes to lead the eye toward the center of interest .
A short focal length lens used from a close viewpoint gives your pictures a greater feeling of depth than a standard lens . Ele- ments in the background recede and appear much smaller in size . Lines and planes converge strongly within the picture to add to the depth . Long focal length lenses used from a more distant camera viewpoint have the opposite effect .
Focal length and perspective
The pictures above were taken with three different lenses - 28 mm , 50 mm , and 135 mm . In each case the camera distance has been changed , greatly altering the per- spective . But the different focal lengths of the lenses have kept the statue the same size .
With the wide - angle lens , top there is a strong feeling of depth in the picture and objects in the background appear small and dis- tant . Some of this depth is lost with a more distant viewpoint and 50 mm lens , center , and the back- ground objects are brought much closer . Using a 135 mm lens , bottom , the background appears almost on the same plane as the foreground .
The picture , left , was enlarged from the marked mm lens picture on the opposite page . The perspective is the same as in the 135 mm picture to its left , showing that changing the focal length really only affects magnifi- cation . Perspective ( the size ratio of near and far objects ) is altered by camera distance .
Both pictures were taken at the same aperture but the wide - angle lens gives a much greater depth of field . This is explained on page 94 .
Perspective
Another important effect of using different lenses is the way they help you to alter the linear perspective in your pictures . The eye judges distance by the way objects diminish in size , and the angle at which lines and planes converge . This is what we mean by linear perspective . Using the right combina- tion of camera distance and lens you can make the whole picture look deep or shallow , as shown in the three pictures , right . The feeling of increased or reduced depth is purely illusory , but is an important compositional technique , ( see pp . 114-15 ) . You can , for example , use steep convergence of lines or planes to lead the eye toward the center of interest .
A short focal length lens used from a close viewpoint gives your pictures a greater feeling of depth than a standard lens . Ele- ments in the background recede and appear much smaller in size . Lines and planes converge strongly within the picture to add to the depth . Long focal length lenses used from a more distant camera viewpoint have the opposite effect .
Focal length and perspective
The pictures above were taken with three different lenses - 28 mm , 50 mm , and 135 mm . In each case the camera distance has been changed , greatly altering the per- spective . But the different focal lengths of the lenses have kept the statue the same size .
With the wide - angle lens , top there is a strong feeling of depth in the picture and objects in the background appear small and dis- tant . Some of this depth is lost with a more distant viewpoint and 50 mm lens , center , and the back- ground objects are brought much closer . Using a 135 mm lens , bottom , the background appears almost on the same plane as the foreground .
The picture , left , was enlarged from the marked mm lens picture on the opposite page . The perspective is the same as in the 135 mm picture to its left , showing that changing the focal length really only affects magnifi- cation . Perspective ( the size ratio of near and far objects ) is altered by camera distance .
Both pictures were taken at the same aperture but the wide - angle lens gives a much greater depth of field . This is explained on page 94 .
تعليق