Canon EF 50mm F1.8 STM lens review: Thrifty fifty

Introduction Specifications and FeaturesLaunched some three months ago, the new EF 50mm f1.8 STM replaces the previous Mark II model, and although it is still intended as an entry-level prime, it features a number of enhancements over its cost-conscious predecessor. With a total of 6 elements arranged in 5 groups, the optical formulae of the two models remains unchanged. The new better-made version, however, focuses closer down — from 17.8” (45cm) to 13.78” (35cm), has improved coatings, and features a circular 7-bladed aperture. It also includes a stepper (STM)-type motor for quieter and smoother AF, a