FlexBody, ArcBody, and PC Mutar for Digital Imaging and Film Photography 217
Figure 13-1 Straightening verticals in the computer. The vertical lines in this picturesque
entrance were beautifully straightened in the computer. Original image was made with a
Distagon 50mm lens on a V system camera equipped with CFV digital back. (Photo by Bob
Gallagher.)
The light rays from wide angle lenses that go to the corners of the image enter the fi lter
and the glass at an oblique angle and have to travel a different distances. As a result, the focus
point is moved out producing a curved image plan that results in unsharpness at the edges
of the image. The effect is most notable with extreme wide angle lenses and/or with extreme
tiling or shifting of the image plan and on the large 36.7 49.0 sensor. The problem hardly
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