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.

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...

Bought for my 6D so I could take it to work, have a compact light package but still being full frame. People might sniff at the fact the lens is only 2.8 but for most every day uses this is all you need.

The 40mm is always ready for use, it is so thin it is almost a mirror cover, but whip it out and snap snap away, yes it may not be the best lens in canons line up, but sheer conveinence it wins hands down. It has good bokeh and can get quite close to a subject without distortion of the lines.

I didn't buy the nifty fifty due to its somewhat low build quality. So when this lens was announced in the 'cheap enough not to really worry' price bracket, I snapped one up. I think with the EF 40mm pancake, Canon have the balance right. It's not an 'L' lens but does have a metal mount.

Fantastic lens for the price and weight.

The Canon EF 40mm f/2.8 STM ($199.99 direct) lens is one of the smallest you'll find for Canon cameras . Its pancake design barely juts out from a camera when mounted. It can be used on full-frame and APS-C D-SLRs, and provides smooth autofocus for video recording when paired with the EOS Rebel T4i...

Extremely compact; Very sharp; Minimal distortion; Inexpensive; STM focus motor

Focus-by-wire design; Modest f/2.8 aperture

Super images, especially considering the size and price. On an APS-C body, it's a 60mm "normal" lens that's biting sharp wide open, edge to edge. Keep it in your front pocket. On full frame it's a little soft wide open, but still charming. I hope Canon continues to make lenses like this.

Awesome "normal" lens for APS-C

Focus a little slow