Canon 22mm f/2 STM
Canon EF-M 22mm f/2 STM (43mm filters, 0.5'/0.15m close-focus, 3.6 oz./101g, about $250.) enlarge. This free website's biggest source of support is when you use these links, especially these links directly to it at Adorama or at Amazon, when you get anything, regardless of the country in which you live. Thank you! Ken.
Sample Image Files
Pretty darn sharp for wide-open at f/2, especially considering that this palm frond isn't flat!
Pretty darn sharp, especially considering that this chair seat isn't flat.
This Canon EF-M 22mm f/2 STM is a tiny lens with superb optical performance. This tiny thing isn't much bigger than a lens cap, and has fantastic optics.
It has a metal barrel and mount, but the filter ring and the insides are all plastic. It's made in Taiwan.
It has no Image Stabilization.
Compatibility and Formats
Canon calls this the CANON LENS EF-M 22mm f/2 STM.
EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF.
-M means that it's a different, smaller mount, so it only works on the EOS-M cameras.
STM means that the autofocus motor is a stepper motor.
Canon 22 2 STM. enlarge.
7 elements in 6 groups.
One aspherical element.
Multicoated mostly in green and magenta.
Used on an EOS-M 1.6x camera, it will see about the same field of view as a 35mm lens sees on full-frame.
Angle of View (on EOS-M 1.6x cameras)
Close Focus top
0.5 feet (0.15 meters) from the image plane, specified.
Maximum Reproduction Ratio top
Minimum Subject Field top
2.83 x 4.29 inches.
72 x 109 millimeters.
Front, Canon 22mm f/2 STM. bigger.
7 rounded blades.
Stops down to f/22.
Focus Scale top
The ring turns without stops; it's just an electronic encoder.
Depth-of-Field Scale top
Infra-Red Focus Indices top
43mm thread, plastic.
Does not rotate, but moves in and out with focusing.
Canon specifies 2.40" (60.9 mm) diameter by 0.93" (23.7 mm) long.
3.575 oz. (101.3g), measured.
Canon specifies 3.7 oz. (105g).
Plastic screw-in EW-43, $29.
I wouldn't bother with it; it looks quite useless.
New 43mm E-43 front cap, included.
EB rear "dust cap," included.
LP811 sack, $24.
I'd use a tube sock instead.
Made in Taiwan.
Canon Product Number top
23 July 2012.
Shipping Since top
Price, USA top
2012 July - 2013 January: $250.
Box, Canon EF 22mm f/2 STM.
The Canon 22mm f/2 STM is the smallest and lightest lens ever made by Canon for its EOS system, however it only works on the tiny EOS-M cameras.
Autofocus is neither fast nor silent, but it is accurate.
There is no switch; you have to screw with in-camera menus.
Autofocus speed on the EOS-M is slow but sure; fast enough for scenic shots, but nowhere near fast enough for people or action shots.
The 22mm f2 hums like a stepper motor as it focuses: a quiet, precise hum.
AF Accuracy and Consistency
AF accuracy is dead-on on the EOS-M.
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.
It only works if the camera is both on and awake.
There is little direct relationship between the motion of the ring and the motion of the lens, and there is some time delay.
Focus breathing is of interest to cinematographers who don't want the image changing size ("breathing") as the lens is focused among different subjects.
The image of the Canon 22mm f/2 STM gets larger as focused more closely; it's a unit-focusing lens.
Coma, or saggital coma flare, is when points of light in the corners turn into batwing-shaped blobs. This is often a problem with fast normal or wide lenses.
I didn't expect to see any on this modern aspherical lens, but lo and behold, there is some in the far corners at f/2. It's much better at f/2.8, and gone by f/4.
This Canon 22/2 STM has no visible distortion at 10 feet (3 meters) as shot on the EOS-M.
For more critical use, use a factor of -0.5 in Photoshop's Lens Distortion tool to remove the slight pincushion distortion.
Canon 22/2 STM.
Ergonomics are drab: There are no controls on this lens.
There is a manual focus ring, and it responds poorly.
It's easy to mount and unmount from a camera, however the index dot is merely painted, so it won't be felt in the dark.
Shot on the EOS-M with correction enabled, there is no visible falloff at any aperture.
43 mm is a huge filter size for the tiny optics of this lens.
It works without vignetting with many stacked filters, but watch it: Canon cautions to use just one so you don't damage the wimpy internal mechanics of the focus mechanism.
The 22 STM has some ghosts if you push your luck shooting into the sun and putting dark things in place to see the ghosts, and giving enough exposure. It is much better than the 18-55mm STM.
There are no color fringes when shot on the EOS-M with correction ON.
Macro is sharp and close:
At close-focus distance, f/8 at 1/250 at ISO 100 on EOS-M, +3 saturation, 6 sharpening.
Crop from above image at 100%, 18 MP EOS-M. If this is 6" (15cm) on your screen, the complete image would print at 52 x 35" (135 x 90 cm) at this same magnification.
You can see all the dirt on my watch crystal.
Rear, Canon EFM 22 f/2 STM. bigger.
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.
None, you use the filter threads.
Front of lens
Seems like all plastic.
Moisture seal at mount
Paint on plastic.
Regulatory certifications are shallow enough to remain black-on-black, while the CANON and other white markings are engraved deeply enough to hit bare aluminum below.
Mounting Index Dot
Engraved and filled with white paint.
Laser-engraved into bottom of lens barrel.
Shows as silver on black.
Noises When Shaken
Taiwan, hidden in black on the inside black plastic rear light shield.
The Canon 22mm is super sharp at all settings, however coma softens the far corners a little at f/2.
Here is Canon's rated MTF curve:
Canon 22mm f/2 STM MTF.
With a rounded 7-bladed diaphragm, sunstars have diffuse, not sharp, points.
They aren't often seen.
For the best sunstars, shoot at f/11 or smaller and pray.
As of January 2013, this Canon 22mm f/2 STM is the only fixed lens available exclusively for the Canon EOS-M, and it won't work on any other camera.
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.
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