Photometry in this era reflects a consolidation of measurement methods and instrumentation driven by rapid advances in postwar technology. The period emphasizes high-sensitivity detectors, robust calibration, and cross-instrument comparability, enabling time-domain measurements, sky brightness studies, and precise stellar photometry. The adoption of photomultiplier tubes and related devices accelerates the diffusion of quantitative photometry across observing programs, while methods to suppress stray light and improve throughput begin to unify disparate photometric approaches. This phase also sees growing attention to discussing instrument response and throughput as essential components of accurate brightness measurements across different optical configurations.