The 40mm "pancake" lens from Canon is the first prime pancake lens that Canon has released. I purchased this lens about 5 days ago, and I took it with me on vacation to Asheville, NC. I used it to do some street photography on my EOS 70d.

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

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

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

The Canon EF 40mm f/2.8 STM is an appealingly simple, compact and capable lens that's equally at home on an APS-C or full-frame DSLR camera. It's also very cheap, making it a worthy addition to any EOS user's camera bag.

The EF 40mm f/2.8 STM is a fairly unprepossessing little lens, and its tiny size and relatively low price might make you wonder whether significant compromises have been made in its design and construction.

Very good optics; Tiny size; Silent autofocus; Responsive electronic manual focus; Decent construction; Low price

Can be susceptible to flare; No lens hood supplied; AF speed isn't the fastest

The EF 40mm F2.8 STM offers excellent image quality in a tiny, well-made package. For APS-C users it provides a great carry-everywhere complement to a kit zoom, and for full frame shooters it's an excellent general-purpose 'normal' lens. The STM motor means that autofocus is almost completely silent, but it's not super-fast.

Canon SLR owners who want the image quality of a prime in a tiny, relatively inexpensive package.;

Photographers shooting in really low light or aiming for maximum background blur. They'll do better with a faster lens like the EF 50mm F1.8 II;

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.

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.

"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.