A team of scientists at the California Institute of Technology (Caltech) has introduced an innovative autofocus technique named Digital Defocus Aberration Interference (DAbI), which addresses the common challenge of maintaining focus in microscopy. Traditional methods require manual adjustments every time a slide is moved, consuming valuable time for researchers. DAbI, developed by graduate students Haowen Zhou and Shi 'Josh' Zhao under the guidance of Professor Changhuei Yang, employs two LED lights illuminating a sample from different angles. This generates a fringe pattern that correlates with the sample's distance from the focal point, allowing a computer to automatically adjust focus. The technique has been tested across six types of microscopes, showing exceptional results, especially with thick 3D samples, achieving a focus range nearly 300 times larger than conventional methods. The team collaborated with other labs to test DAbI on various biological samples, including brain slices and organoids, demonstrating its effectiveness even in complex structures. If integrated into standard microscope systems, DAbI could transform the imaging process, making it faster and more efficient for researchers.