1. The thinnest and lightest "pancake lens" in the EF lens series ・As a result of the use of a stepping motor (STM) and other factors, the lens has a thin profile of only 22.8mm in length, almost the same as the diameter of a 100 yen coin at 22.6mm, and a lightweight design with a weight of approximately 130g.2. Superior image rendering performance ・Aberrations are well corrected through the use of a single glass-molded aspherical lens with special optical elements, resulting in F2.8 brightness and high image quality with high resolution and high contrast throughout the entire range from the center to the periphery of the lens.Flare and ghosting are minimized by optimizing the lens arrangement and coatings.A 7-blade circular diaphragm produces beautiful bokeh out-of-focus effects.3. Various designs for comfortable shooting ・Adoption of a stepping motor (STM) for the AF drive enables quieter and smoother AF drive control than DC motor-equipped models such as the "EF-S18-55mm F3.5-5.6 IS II" (released in March 2011).Micro-step drive control of the aperture mechanism realizes silent operation.・Minimum focusing distance of 0.3m enables photographers to get closer to the subject.・After autofocusing, the camera is equipped with a full-time manual focus mechanism that allows the photographer to make final focus adjustments by simply rotating the focus ring after one-shot AF for immediate manual focusing.