Canon EF-M 22mm f/2 STM lens review at SLR Gear: "Given the few options available (as of February 2013) for Canon EOS-M users, having this prime lens as an option is a no-brainer."

'Few options'? Yeah right, when it comes to mirrorless cameras the options given by Canon are even fewer, so far their only offering is the EOS-M 'slug-o-matic' camera:

"The Canon EF-M 22mm ƒ/2 STM provided surprisingly sharp results. When used wide open at ƒ/2, there is some corner softness to speak of, but the majority of the frame is very sharp. Stopping down to just ƒ/2.8 provides very sharp images - for practical purposes, we would say it's tack-sharp from corner to corner. According to the raw numbers you'll have to stop down to ƒ/4 to see the sharpest results, but to the naked eye I doubt you would see the difference. The lens is sharp all the way to ƒ/8, where diffraction limiting begins to set in, but there isn't a significant impact on sharpness until ƒ/11, and even then it's just a slightly overall decrease. Images start to lose their sharpness at ƒ/16, and become moderately soft at ƒ/22." . . . read more

Canon EF-M 22mm f/2 STM Lens review by Ken Rockwell: The Canon 22mm is super sharp at all settings, however coma softens the far corners a little at f/2.

The Canon 22mm f/2 STM is inside out from a modern pro lens: it's metal on the outside for show, and plastic on the inside for low cost. It's super-compact and performs excellently, so I'd strongly suggest it for the EOS-M, since the whole point of the EOS-M is tiny size. This lens is tiny. Manual focus is awful; don't bother trying to use the manual focus ring. The ring is merely an input to a computer, which in turn controls the lens motor — if you have everything else set properly. . . . read more

Overview

Description by Canon:

A 22mm wide-angle pancake lens with EF-M mount - ideal for stunning landscapes and everyday reportage with the EOS M. An f/2.0 maximum aperture delivers great low light shots in stills and movies.

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