This lens just arrived yesterday and I think it will be just perfect for my purposes. I wanted a small lens to put on my 60D that had a large aperture ,a close focusing distance and did a decent job of rendering backgrounds out of focus.

Easily Interchangeable; Fast / accurate auto-focus; Lightweight; Nice Bokeh

Not Easy To Manual Focus

Great lens for the money.

It is sharp, F4+ is really the sweet spot here. Wide open the photos are usable but some distortion occurs in lower light settings. I used this lens at the aquarium and got some very good and usable shots from 2.8-5.6.

Decent Focus; Low light; Portable; Sharp

Build Quality; Some Noise Wide Open

This is a brilliant lens that is wonderful to use out on the street due to its very low profile. When I take the battery pack off my 5D Mark III and replace my Canon "cannons" with this lens, I feel like I'm carrying a point and shoot!

Bright Image; Easy To Use; Quality Construction

None Discovered So Far

For the money, this lens is great. I use it on a 5D Mk 2 and it works really well for product photography.

Small and lightweight Sharp

None that I can think of at this price

I have heard this lens described as cute, tiny and a toy. I suppose it is cute and it is very small but it is not a toy. The build quality is very good. It will add only 130g to the weight of your camera.

Wait!!!! It's Sharp!!! Well, the review is for all those who are in dilemma between 50mm f1.8 and 40mm f2.8. On the spec sheet one would think that 50mm beat the hell out of 40mm, with it's larger aperture and better focal length for portraits.

The lens provides excellent auto focus for both video and still. I am using the lens in EOS-650D which gives an excellent clarity for portraits and closeups.

Fast / accurate auto-focus; Nice Bokeh

Lens Creep

I bought this lens as a walk-around lens. It is not as fast as my 50 1.2 but is much much lighter and most important, do not draw attention. It makes my 6D looks very discrete. It is also cheap for what it delivers.

Small; light; small and light again..; Superb sharpness even wide open; Don′t draw attention at all...

STM focus wont manually work in auto mode; In manual mode still has an delay, You cant operate focus if camera is turned off or if the lens is detached, making impossible to retract the front element, It is quieter than old focus systems but is still audible

This is an exellent lens,I use it mayly for head shots,but for my porpose,I but I rather use the24mm f/2.8 STM,to me its the perfect lens for all an around lens unless you want to use a zoon lens.

It′s amazing, especially for night shoot′s, I'ts light and inexpensive in comparison to others. It′s perfect for low light shots and you will never regret getting it nor will ever let it go.