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p.2 #2 · p.2 #2 · Crop sensors and their perspective changes. | |
And this would be the arsenic pit:
rw11 wrote:
why don't we argue that it is really reproduction ratio not distance that matters
Reproduction ratio has nothing to do with perspective.
Distance to objects in the scene is the only thing that affects perspective. This determines the relative size of objects in the scene.
Prints made from several cameras at the same position will have the same perspective, regardless of the focal length, print size, sensor size, or viewing distance.
Objects in each print will have the same relative sizes to each other. It doesn't matter if the crop factor camera used a 50 mm lens and the 8x10 camera used a 450 mm lens. Similarly it doesn't matter if the crop factor camera used a 350 mm lens and the 8x10 camera used a 60 mm lens. Likewise, it doesn't matter if one print is 8x10 inches and another print is 80 x 100 cm. It doesn't matter if one print is viewed from 16 inches away and another is viewed from 16 feet away.
Once the picture is taken, the perspective is fixed.
Apparent perspective is a different matter. That depends on viewing distance and print size and crop factor (angle of view). There is no such thing as "telephoto perspective" or "wide angle perspective".
Make a photo from a fixed position with one camera with a 24 mm lens and a 50 mm lens and a 100 mm lens. Make an 8x12 inch print of each. View the 24 mm image from 10 inches, the 50 mm image from 20 inches, and the 100 mm image from 40 inches. They will all appear to have the same amount of, or lack of, focal length 'distortion'.
Likewise if you make a 32 x 48 inch print of the 24 mm image, a 16 x 24 inch print of the 50 mm image, and an 8 x 12 inch print of the 100 mm image and view them from the same distance (say 20 inches), they will all look equally 'distorted' and equally 'undistorted'.
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