I really didn't feel this was the lens for me, quite slow to focus and not as good as its 35mm and 50mm counterparts

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.

Pros: Small form factor Pretty Sharp Pictures Cons: None Other thoughts: I am using it on both Canon 7D Mark II and Canon 80D... and the pics are coming out clean. I would say that this is a great lens for street photography. Doesn't add much weight to the camera body.

I am using this lens with an SL1. This is a great camera and lens combination. I have the 18-55 STM which is also very good, but the size, image quality and small aperture of the 40mm makes it an excellent all around carry lens.

Image quality; size; aperture; build quality

None

Wont feel lazy to carry this everywhere i go - Fits well on my 7D and now its easy for me to carry my camera ever were for clicking desert pictures.

Amazing quality ; Original; Compact and good for carrying everyday

Absolutely Nothing

This Lens has been Awesome taking Christmas Pictures Lens it's great in low light and the STM is amazing for Video I have this and the 50mm f1.8 and I use this 99% of the time absolutely amazing little lens makes the Camera almost compact I use it on the Canon T5i and no regrets in buying it and I...

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.

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.

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

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