Canon EF 40mm f/2.8 STM Standard Lens: This standard Canon lens offers high-quality image capturing in a small, lightweight lens body, making it a great companion in crowds and public spaces. Its versatile features and easy portability make it especially suited for basic travel, portraits and memento shots.
I am using this lens on my 7D and it is barely noticable on the camera. This is bargain of a lens at this price. It is tack sharp through most of the stops. It produces a wonderful bokeh with a nice pleasing separation of the subject from the background. When trying this out for filming the lens makes very little noise when focusing. It's hard to believe that such a small lens could be so versatile.
What's not so great: The manual focus ring and how the lens stays extended when the camera is powered off