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Forum: Pentax K-1 & K-1 II
05-18-2016, 10:53 AM
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EDIT: I just noticed that other people already corrected this, but I'll just leave this here for anyone interested in a more detailed explanation of perspective and "wide angle distortion", as this misconception is quite common.
Perspective is entirely controlled by distance. If A and B are the same size, but B is twice as far as A, B will look half the size of A. It's that simple. No properties of lenses or cameras, just pure geometry. Compare the same two objects, and you will find the ratio of their sizes are the same for any rectilinear lens (or your own naked eyes) when shot from the same distance and orientation.
"Wide angle distortion" (objects on the edge of the frame look bigger/stretched compared to the center) is a property of "rectilinear" (gnomonic) projection, and is controlled purely by angle of view in rectilinear lenses. It is a result of mapping a spherical scene onto a flat plane. As the angle approaches 180 degrees, the distortion (stretching) approaches infinity. All rectilinear lenses display this property, just that the size difference between the center and the edges only becomes noticeable as you get very wide. If you've ever seen a video game that lets you dynamically adjust FOV (AOV), you will see this is a property of the geometric projection, not of any lens in particular.
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