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
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