Tiny lensless endoscope captures 3D images of objects smaller than a cell

Researchers have developed a new self-calibrating endoscope that produces 3D images of objects smaller than a single cell. Without a lens or any optical, electrical or mechanical components, the tip of the endoscope measures just 200 microns across, about the width of a few human hairs twisted together.
Source: Science Daily, https://www.sciencedaily.com