A triplet lens is an optical design consisting of three elements: a diverging lens placed between two converging lenses. This configuration corrects for chromatic and spherical aberrations, producing sharper and more accurate images than simpler lens designs.
Photographers and lens designers use triplet lenses to achieve high-quality imaging in cameras, projectors, and other optical devices. Understanding this lens type allows for better control over image sharpness, contrast, and overall optical performance, making it a fundamental element in precision photography.