However the following quote from Roger Hicks is useful. In my experience this distortion is also a function of the subject distance, but I can not find any rigorous descriptions. This positional distortion is obvious with nearby objects viewed using wide angle lenses.
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Square objects appear rectangular and spherical objects resemble ovals. Newcombe's classic book "35 mm Photo Technique" starting on p 80.Ī third kind of distortion has to to with the elongation of objects as the are moved from the center of the frame to the edge. The above is more clearly described and exemplified in H.S.
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Tilt-shift lenses are another means to eliminate converging verticals. These effects are eliminated when the sensor is square to the subject on both the horizontal and vertical axes. Ke stoning or converging verticals are a subset of perspective distortion. This is exactly so when the object is in the center of the frame. The size of an object is not distorted just because the camera is close to it. Distortion means the object's appearance does not match it's actual measurements. There is no such thing as perspective distortion. This effect has nothing to do with optical deficiencies or artifacts due to lens design. The term of perspective distortion is unfortunate because what is being described is actually a view that appears odd compared to what the human eye and brain sees. Instead objects closer to the camera appear larger as the the lens to subject distance decreases. Perspective distortion refers to the relative size of multiple objects does not change when cameras with different sensor sizes or focal lengths have identical subject to lens distances. They are fundamental properties of imaging and are not distortions. These sort of distortions are caused by projecting a three-dimension scene onto two-diemsional plane. This class of image corrections should not be confused with the corrections discussed above. Image distortions that are not caused by deficiencies in optic designs are corrected separately. User created Profiles are available on Adobe's web site and elsewhere. They are applied using the same method Adobe's corrections are applied.Creating a user lens correction profile is a tedious, technical task. These Profiles can be manually added to LR.
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Adobe Labs publishes a detailed manual for users to create their own lens correction Profiles. These are the lens correction Profiles that come with LR.ģ. In these situations Adobe Labs reverse engineers a set of correction parameters based on a rigorous technical evaluation of the lens. In other cases the manufacturer doesn't bother to compute lens correction parameters. They are in the RAW file but LR can't use them because LR can't decode them.
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The brand does not share them with other companies. The lens' engineers' correction parameters are proprietary. These corrections can not be disabled (unless the raw file is modified). The file format is an open-sorce format so anyone can read and apply the lens corrections.LR automatically applies there corrections. The lens' engineers include correction parameters in the RAW file. Lens corrections in LR for optical flaws come in three flavors.ġ.