Duallens

Duallens refers to an optical arrangement that uses two lenses in a single system. The dual-lens setup can produce stereo images for depth perception, enable different focal paths for multi-image capture, or combine images from two sensors to improve resolution or low-light performance. The concept is used across photography, videography, and imaging technologies to obtain information that a single lens cannot easily provide.

Configurations vary. In consumer devices, dual-lens cameras commonly place two physical lenses on the back of a smartphone. Some designs use a fixed pair with different focal lengths for optical zoom, while others feed two lenses to separate sensors or to a shared sensor, enabling depth sensing and computational photography effects such as portrait mode or augmented reality depth maps. Other implementations use two lenses with overlapping fields of view for stereo recording or for simultaneous multi-focal capture in professional equipment.

Technical aspects include the baseline distance between lenses, focal lengths, and sensor characteristics. Accurate alignment and calibration are essential to minimize parallax errors and color or exposure differences. Image data from the two viewpoints are often fused by software to produce a depth map, 3D representation, or a composite image with enhanced features such as bokeh or high dynamic range.

History and usage span from early stereo photography in the 19th and 20th centuries to modern digital systems in smartphones, drones, and industrial imaging. Applications include depth sensing for AR/VR, 3D modeling, robotics, and medical imaging, where dual-lens configurations help capture spatial information and multiple perspectives.