I love this lens. I prefer to use prime lenses over zoom lenses and I bought this lens to replace the "nifty fifty" that was recommended to me when I bought the camera body. This lens is a much higher quality and takes better images. The auto focus mechanism is also a lot more responsive.

High quality construction; compact size; amazing price

Nothing

I should say this is a great value for what it is: a sub-$200, fast 40mm EF lens with well regarded sharpness stats even wide open. Where the EF 40mm f/2.8 STM is a huge letdown is in the realm of video. There is distinct and audible autofocus hum that is recorded on your video.

A great walk around that is perfect for low light situations. This is a lens you will be happy with because of its STM abilities,of its weight and the quality of construction and picture quality.

This is my second of these. It is better value, better build, and picture quality than the basic 50mm Canon lens. It's a tough little thing and I use it about 80% of the time compared with my other lenses.

Had this lens for a few weeks now and I find myself using it more and more. It is a great all round lens delivering high quality images and for street photography it's a must have. Good value for money.

Worth every penny, chose this instead of 50mm prime. its fully worth of 2K extra money... suggest you to go for this.. it produces stunning pics at f/2.8 compared to 50mm's f/1.5

There was a lot of hype after Canon's release of the 40mm pancake lens & I wondered if it was worth getting this inexpensive prime lens versus saving up for L glass for 10X or even 20X the price & made the leap when the price dropped.

"This is a fun and sharp little lens. I own the 50mm f1.8 as well, and I prefer the 40mm. Why Better build quality, the 40 is similar construction to my 18-135mm STM, better image quality than the 50, quieter auto focus, and a slimmer profile.

This lens takes great portraits with its sharp image result at very affordable price. It (auto) focuses quite good for portrait but not macro. It's extremely light weight and it's build is good. Although the side of the lens has printed the word Macro, it cannot take true macro image.

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.