Great wide-view lens for Canon EOS-M
595146
It was really sad that EF-M 11-22mm lens is not released in US market. Through Amazon, I got this lens from Korea (surprisingly).

When I tested this camera for landscape photos under severe conditions, such as capturing the sun directly, after sunset (much less light condition), etc.. Its flare & ghost control was really amazing. It was even better than regular EF lenses. Also the image quality by 11mm focal length was so great. I could not realize the distortion of image. The canon did the great job on this lens.

The only downside is the price. Since it was not released in US market, it is still more expensive than other EF-M lens. However, if you are serious about the landscape photos, I recommend it. The color along with its performance is great.
4791979
I photograph professionally and I was looking for a wide angle lens. The reviews on this Tokina lens were very good and I was not disappointed. Well built, nicely balanced super sharp, what more do you expect from a lens! I  bought this lens for a cropped sensor camera but it also works perfectly on a full frame sensor camera at 16mm, what a bonus. I have owned the original Canon 16mm to 35mm L Lens, this Tokina is sharper @ 16mm. I have no hesitation in recommending this lens. Also this purchase was from 17th Street Photo fulfilled by Amazon. Efficient, honest transaction. Product was as described. Amazon are great to deal with they have become my go to for photo equipment!
1810374
This is a great lens for the price. I Bought an EOS 7D with no kit lens and purchased this as my first lens. The depth of field makes for some very nice images and the quality of the images is lovely.

For some reason focusing in low light can sometimes be a problem, but it is not a deal breaker in any way.
2369459
I really enjoy using this lens filter--I've coupled it with my Canon 50 mm f/1.8 and it works quite well.  Pulling focus is somewhat tricky, as this has a very narrow focus distance, but if you're willing to play with it a bit, you'll get the hang of it.  It's not quite as good as a legitimate macro lens, but is certainly a good alternative when you're looking to save some money.  The quality is quite nice and the bokeh is lovely.  I would definitely recommend.

I've attached an example image that I took with the Canon 50 mm of a champagne glass to see--this was taken at ISO 8000 (very dark, gross light in this room) at f 2.8 and 1/60 sec with a Canon 5D Mark III.
4025909
From precise macro to wide-angle shots, this lens performs very, very well. The images it produces are tack-sharp. I have all but abandoned my 50mm f/1.8 on my 50D...this lens is closer to "normal" on the crop sensor. The bokeh is marvelous: creamy, smooth, and dreamy. The colors are typically Sigma: that is to say a little warm and not overly saturated but not exactly subdued. The build quality is far better than most Canon lenses in this price range, which is also typical of Sigma. The auto-focus performs well, occasionally seeking at very close macro distances, but that is normal for the small DOF of macro lenses, plus I do not have a ring- or macro-light.

As I said, I use this lens as "normal" on my crop bodies but on the 5D (I have the original not the Mark ii) it really shines as a wide angle lens. 28mm is the perfect indoor angle offering enough field of view to capture everyone in your scene but still allowing use of flash to fill the dark spots using my 580 EX II. I have essentially stopped using the 24-105 f/4L for wide angle work because this lens is so sharp.

Now, the obvious strong point of this lens is the f/1.8 aperture which is sharp, sharp, sharp even wide open with virtually no falloff and almost no CA. I never hesitate to just leave it wide and shoot in TV mode to stop action or to create action trails. Using it indoors at 400 ISO I get perfect images every time without the harshness of flash.

I have used this lens on these bodies with excellent results:
50D
5D
Rebel XTi (400D)
Elan 7 (35mm film)
Elan IIe  (35mm film)
EOS 3  (35mm film)

So for crop or full frame, this is a great walk around, macro, and wide angle lens.
1220320
I bought this for use as a wide angle for my Canon 7D for photo/video use. It is perfect for interior shots and for general video use. Couple this with a fader ND filter and you have a great start for outdoor shooting. There is some distortion on the wide end, but what do you expect at 11mm? There is practically no distortion at 16mm. The images are just a tad soft at f/2.8, but the images look very nice for video when stopped all of the way down. The build quality is fantastic (makes my 50 f/1.4 look like a toy), but wish it had a sealing o-ring around the EF mount. The focus and zoom rings are butter smooth. The only quirk to get used to is the switch from manual to auto focus; it uses a barrel switch. It's not bad, just different from other lenses that I've used. The constant f/2.8 is brilliant. The other offerings from Canon and Sigma both have variable aperture ranges that aren't even is fast as this lens.

Bottom line: best all around ultra wide angle lens for a Canon crop camera. No regrets.
3536952
Simply put this is a great lens. Great for portraits and closeups, decent for everything else. Personally I like wide angle lenses for everyday shooting but this one will get it done too. It's nice in low light situations, like a concert or night club.

So far I've had a lot of success with it, and at this price it's hard to pass up. Check Ken Rockwell's site for a more detailed hands-on review
1162200
I had my doubts about this 2:1 zoom for the Mamiya 645.  Certainly the M645's 35mm wide angle is a real sharp lens, contrasty and distortion-free, which is quite an achievement, so with some caution I picked up the 105-210 zoom and tried it on various subjects, and to my surprise, I found it sharp, contrasty and distortion-free as well.

With my Epson 750 Pro scanner and chromes from this lens, I can generate images that would be impossible with a Canon full frame dslr.
1115793
This lens has been a welcome addition to both my videography and especially photography.

On the lens itself:
The lens is well-built, hardy, and features a very nice focusing ring that makes pulling focus feel smooth and not jerky whatsoever. The face the focusing ring is also not an infinite one, but rather has hard stops at macro and infinity is great as well.

The lens does warrant some criticism though from me at least. On my Sony a7sii, while shooting in 4k, the focus is never easily discerned via viewfinder or lcd screen. Ever. Despite tweaking the peaking, enhanced zoom while finding focus, and other methods, I still find myself guessing at times. Most of the time I use this is with a steadicam (EC1 Beholder) so I will just throw the f-stop to above 10 and that works, but at 2.8 you will have trouble knowing if you're truly in focus while shooting on the a7sii.

For astrophotography however, and wide-shot photography, I'm simply in love with the lens. The focus is wonderful near the middle, and the distortion is easily corrected in your photo-editing software of choice.

As far as wide lenses on a budget goes, this one is the king as far as I'm concerned.
2081798
<a data-hook="product-link-linked" class="a-link-normal" href="/Opteka-35x-HD-Super-Wide-Angle-Panoramic-Macro-Fisheye-Lens-for-Canon-EOS-EF/dp/B000TLVMIO/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Opteka .35x HD Super Wide Angle Panoramic Macro Fisheye Lens for Canon EOS / EF</a>

I love this lens! It's so fun to play with this stuff!!
It's a little squeaky to separate the fisheye from the macro, but I managed to separate them.  It's not so heavy and it can focus ~10cm away from the subject! Compared to the 18-55is's 25cm, it's amazing. Sometimes when you take really close shots, you can get stuffs onto the lens not noticing..
1768301
I bought this lens for portraits and general walk-around photography. It complements my 24-70mm f/2.8L and 135mm f/2L very nicely.

On a crop sensor camera (Rebel series, 40D, 50D, etc.) you will get a full frame field of view equivalent of 136mm, which may be a little long for some pictures. I have a 450D (Rebel XSi), and it works very well on it.

Pros:
- Lightning fast auto focus
- Excellent sharpness, even at f/1.8. It's performance is similar to my 135mm f/2L, which is says a lot.
- The price. You're getting a "sleeper L lens" without spending a fortune. The L version of this lens is roughly $2000. You're getting a lot of bang for the buck.
- Excellent bokeh. Backgrounds are very smooth.
- Well built. It feels solid when I hold it, unlike the plastic kit lens.
- Small size and lightweight. It's very inconspicuous and doesn't stand out.

Cons:
- There's some visible CA when wide open at f/1.8, but not really a problem for most situations. Stopping down to f/2 or f/2.5 will generally fix it.

Considerations when buying this lens:
- This lens has a 3 foot minimum focusing distance. You can't get too close to your subjects.
- The full frame equivalent FOV (136mm) may be too long for those on a crop sensor camera, depending on what pictures you're taking

Overall, I love this lens. I've been very happy with its performance, and the pictures that I get are simply incredible. If you're interested in a good portrait/short telephoto lens, this is the one to get.
3065174
I got this to connect to my ASI1600MM-C for a portable, widefield astrophotography setup and just... WOW!  The ASI1600MM-C I'm using has a 21.9mm diagonal, and I selected the Canon mount so that I'm able to have plenty of room for my filters/filter wheel.  Note this review is from my use perspective and won't hold perfectly true for a 43mm diagonal sensor.

Corner to corner, optical performance is as near flawless wide open as I've ever seen.  Coma and astigmatism are non-existent and color correction is perfect within what I can measure - There is absolutely no change to the size of stars when moving between different filters.  Vignetting isn't bad at all, though I do understand it is about the only weakness of this lens on a full frame sensor.

Build is very good as well - There aren't any flexure in the focus ring or aperture dial, and the plastic used seems to be of a good quality.  The supplied lens hood is decent enough as well.  It's certainly no Otus but it feels better than most of the plastic kit lenses I've used.

In short, if autofocus isn't important to you and you like the 135mm focal range, there is little reason to pass this lens up!
1404643
I have always been a wide angle lens fan, so when I got a new Canon 5D body I decided to get this lens too.

I am very pleased with the brilliant optical performance, but don't think that it is a limited use lens because of the distortion inherent in a full frame fish-eye.

Using my image manipulation software (Paintshop Pro 8) I have corrected the distortion and obtained some stunning wide screen format landscapes which would have required 4 or 5 shots with a standard lens stitched together and the compromises that brings in matching brightness in the join areas.

After a couple of months use I have found  many more uses for this lens than I had imagined, I take it with me everywhere.

The ceiling of a mediaeval cathedral shot with the lens pointing vertically up is a revelation in detail and design which is hard to appreciate with any other lens.
819141
Bought this lens used and use it on my Canon Rebel T3i (EOS600D). The 1.6 crop factor due to a smaller sensor extends the focal reach to approx. 480mm (which is pretty decent for bird/wildlife photography). However, this also affects the aperture in terms of depth of field. So I'm not really getting a F/4 depth of field but rather a F/6.4 (4*1.62). The difference is sometimes noticeable but in most cases for me it has been negligible.

 I love the quality of this lens. It's built with metal so it's super sturdy...a healthy change from my normal EF-S lenses which are mostly plastic. In regards to weight, it's possible to hand hold this lens for long periods of time but a monopod/tripod is recommended for longer wildlife/bird shooting. The colors are beautiful. Some shots I took barely needed adjustment in post-production. The IS works great as well. Attached are some sample shots. Happy shooting!
1950700
This lens has proven to be an excellent macro lens for Canon's 1.6x FOVCF DSLRS.

PROS:
Standing out amongst its features is its fantastic optical quality. 100% crops show to be clean and crisp images, and this is one of those lenses that can rival L lens optics without the premium. This lens has never failed me in color, contrast, or sharpness. A circular polarizing filter does wonders more as well.

Reasonably fast (f/2.8)

USM focusing-fast, generally accurate (see cons)

Light, compact

FTM (full time manual focusing)- note: bear in mind this does not mean if you focus manually and then half-press the shutter button while on AF, that the lens will not autofocus. It will.

Well built (metal lens mount, solid feel, etc)

CONS:

60mm often does not get me a short enough depth of field for my tastes. This is my main gripe with this lens. I see this most often photographing plants. I will step back so I can see more of the plant in my viewfinder, however, in doing this, the increase in distance to the focus point will increase my depth of field too much, even at f/2.8. So, if you can afford the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Canon-EF-100mm-f-2-8-Macro-USM-Lens-for-Canon-SLR-Cameras/dp/B00004XOM3/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Canon EF 100mm f/2.8 Macro USM Lens for Canon SLR Cameras</a>, I would recommend that. For me, I intend on keeping this lens and also purchasing an&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Canon-EF-85mm-f-1-8-USM-Medium-Telephoto-Lens-for-Canon-SLR-Cameras/dp/B00007GQLU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Canon EF 85mm f/1.8 USM Medium Telephoto Lens for Canon SLR Cameras</a>.

Autofocus can be quirky. Sometimes, when focusing on something small in the viewfinder, pressing the shutter button halfway will bring the focus close to, but slightly in front of the desired point. Pressing it again will throw it way off. This can sometimes also happen in very high or low light. However, this is not a common issue, and switching to MF doesn't deter me much.

No IS: be prepared to use a tripod, especially for those high-magnification shots. When shooting at 1:1 or close to it, the "1/focal length rule" does not eliminate camera shake for me, I have to break out the tripod.

At high magnification, you're in close. Like, within a few inches at 1:1.

Other note:
Vignetting is prominent wide open. Sometimes it helps, sometimes not.

Overall, this is an excellent, good-value lens. However, I would recommend the 100mm macro over this lens.
1793759
At a savings of almost $200 dollars over the equivalent Canon lens, this one is hard to beat. I've even used it at wedding events and  it was very useful for large groups in smaller churches.

With that said, there is noticiblebarrel distortion at the wider 10-15mm range, which is to be expected, and something easily corrected in Photoshop CS4 and up.  Besides one of the advantages of having such a wide lens is the altered views you can create.

I did notice a little softness as you move towards the outer range of your photo area but nothing too hard to deal with.

Is it perfect? No  Is it worth the price? - Yes

Now go out and enjoy your camera from a wider angle perspective, you'll be glad you did.
2611081
Overall a great lens and feels significantly wider than the 20-50mm kit lens at 20mm.

I saw some reports of slightly less sharp edges with this lens, which I was able to see a little bit in some test shots, but with normal photos of real subjects, I haven't found it to be an issue. The sharpness is still pretty high even on the edges.

Note that now that the 16-50mm power zoom lens is available, that lens is worth considering as an alternative to this lens, since it has OS and comparable aperture at 16mm (3.5 vs. 2.8). I don't own that one so I can't compare directly.