Using a massive Fresnel element and relying upon the physics of light, photographer Christopher Getschmann built a 'hypercentric camera' that makes objects that are further away from the camera appear larger than what's closer.
explains how a telecentric lens works in more detail. An important takeaway is that telecentric lenses can only “see” objects that are smaller than themselves.
“The most important part of a hypercentric lens is the diameter of the entrance pupil. So, our first lens must be larger than whatever we want to take an image of and if we want to take portraits, well, your lens better be much bigger than a head,” Getschmann says.Getschmann wrapped his aluminum frame and gantry with a tarp to prevent light leaks. The Fresnel lens doesn’t have anti-reflective coating, so any stray light can cause many issues.
The results look great with his camera about “two focal lengths” from the large Fresnel front lens element. Well, not “great” in a traditional sense as the Fresnel lens doesn’t have anti-reflective coating and isn’t designed for high-end imaging performance, but they deliver the desired effect.
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