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.

I can't believe how long it took me to purchase this lens. This review is for full-frame use. I've been rolling my eyes at it ever since it first came out. How can this lens be any good Recently reading various technical reviews raised my eyebrows and quickly changed my opinion of this lens.

A low-profile lens for street photography, suited for full-frame cameras...

Extremely slim and lightweight; Excellent optical quality

Unsophisticated focus system; Thin manual focus wheel

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.

I bought this lens to go with the RP body (with adapter). Lens and adapter is shorter/smaller than the smallest RF mount lens offered presently. RP hasnt arrived yet, but on my 5DmkIII Im getting results far beyond the price of the lens. Almost perfectly sharp, corner to corner, wide open.

Canon is the only major Japanese camera manufacturer who has been shy of entering the mirrorless market (as of the time of this review). So far their reps always argued that it is possible to design smallish APS-C DSLRs that are also able to compete on the size and weight side.

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.

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.

Bought this impressive little lens with a Canon SL1. Makes my camera feel even smaller. Pictures are amazing and portability is great. Good at night shots and even better for portraits. Focus is not as fast and quiet as the new18-55mm STM that comes with the SL1, but its still a great lens.

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