The Canon EF 40mm f/2.8 STM represents a bit of a debatable concept on a DSLR - at least when compared to the much smaller mirrorless camera system. Honestly speaking there is also not really much of a size and weight advantage when thinking of its closest cousin - the Canon EF 50mm f/1.8 - which is...

This lens is a "always on the camera" lens - it's wide enough for taking pics of landscapes, groups of people and you can go rather close with it too - it's my new Allrounder --- on my 5DII I can work undercover because it is so so unspectacular - which works for me!

very compact - good usage for street photography - f 2.8 is fully usable but best results with f5.6; autofocus is quick,exact and nearly quiet

Build is far away from L but much better than the 1.8/50 II; so it's good enough for normal usage

40mm might appear to be a bit of an odd focal length for a lens, but after spending a week with Canon's first pancake lens, it makes complete sense on our crop-factor EOS 60D.

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.

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

Autofocus Lens is a compact and portable macro lens meant to introduce novice photographers to close-up image-making. Its cost, design, and overall size all lead the tyro to comfortably accessorize their kit lens, and begin developing a library of optics for their camera.

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 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.

Good bang for the buck. Works on full frame or C sensor cameras. So small it makes even the biggest camera usable anywhere. Good in low light , no flash situations, and auto focus works quite well.

The Canon EF 40mm f2.8 STM is the company's first 'pancake' lens, designed to be as small and light as possible. Measuring just 22.8mm thick, it protrudes to roughly the same degree as the grip on many DSLRs, and at 130g you'll hardly notice it when mounted.