50mm "Normal" Lens... Ok, but "Normal" on FF or APS-C Sensor?

Started Nov 10, 2012 | Discussions thread
Lee Jay Forum Pro • Posts: 52,214
Re: Oops!

jrtrent wrote:

"Photographers, cinematographers, and computer-graphics engineers create striking pictorial effects. By using different focal length lenses, they can make a scene look compressed or expanded in depth, make a familiar object look natural or distorted . . . We examined the perceptual and geometric bases for why these effects work. We found that people’s preferred field of view when looking at pictures leads them to view long-focal-length pictures from too near and short-focal-length pictures from too far. By following the popular 50mm lens rule of thumb, photographers greatly increase the odds of a viewer looking at a photo from the correct distance, making the percept undistorted. . ." http://www.emilyacooper.org/Emily_A._Cooper/Photographic_Practice.html

"the correct distance".  How is that defined?

http://en.wikipedia.org/wiki/IMAX#IMAX_Dome_.2F_OMNIMAX

"The dome system, which the San Diego Hall of Science called OMNIMAX, uses films shot with a camera equipped with a fisheye lens on the camera that squeezes a highly distorted 180° field of view onto the 65 mm IMAX film. The lens is aligned below the center of the frame and most of the bottom half of the circular field falls beyond the edge of the film. The part of the field that would fall below the edge of the dome is masked. When filming, the camera is aimed upward at an angle that matches the tilt of the dome. When projected through a matching fisheye lens onto a dome, the original panoramic view is recreated."

In other words, a 180 degree fisheye is "natural" for that viewing method.

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