Pro: Great image quality, especially for available light portraits shot at f2.8 where you want a pleasingly blurred background. The IS is good but see note below.Con: Weight if you plan on carrying it around all day on a pro camera body.This is a great lens and if I didn't also own the 70-200mm f4.0L IS Canon lens I would have rated it 5 stars. IMHO the f4 is a better all around carry lens if you don't absolutely have to have the f2.8 aperture. The IS in the f4 is Canon's latest and is usable up to 4 stops slower shutter speed than you'd normally need at less than half the weight. The 2.8 version uses the very good, but older, 3 stop IS. On the surface you would think that the f2.8 aperture being one stop faster would place them on even ground where IS is concerned but it does not. the newer IS on the f4 version is INCREDIBLE in operation! To be fair to the 2.8 lens, given the same lighting conditions, it gives you one full shutter speed faster that may make a difference if stopping motion is needed in the shot. My best advice is to not end up with both lenses becuase it is so hard to decide which one to take along!

Are use this Lens mount on my new canon M 50, unfortunately the camera was defective but the lense mount did its job.

I'm not an expert. You can find technical reviews by those guys and girls below. I want to say to fellow beginners, this lens is awesome if you are looking for sharp subjects and soft, blurred backgrounds/foregrounds. It is the first "upgrade" I've purchased for my Canon 550D and I'm blown away by it. I don't have a whole lot of comparitive experience with lenses, so I can't say it's better or poorer than this or that. It's obviously has advantages over the Canon 18-55mm kit lens that came with the camera, namely it's larger aperture. This makes for a very shallow depth of field set to f1.8. I'm talking I heald the camera at arms length for a selfie and the stubble on my chin was in perfect focus, while the stubble on my jaw back towards my ears was starting to blur. The background just disappears into soft glowing orbs. Beautiful. If you shoot in manual mode (as you definitely should learn to do) this is easy to account for and adjust by closing the aperture (raising the number from 1.8 and decreasing your shutter speed until you have the depth of field you want. The larger aperture also allows for significantly better performance in low light situations. There is no zoom factor with this lens, but the autofocus seems to work great. Video is beautiful as well. If you like to experiment and be creative, you'll love this lens. I'm including a photo of a football that was my 3rd test shot out of the box. It illustrates some of the effects I've mentioned.

Prior to my purchase of the Canon EF 70-200mm f/2.8L IS USM, I was torn between this one and another Canon lens, the 70-200mm f/4 IS USM. My research and reviews on the two lenses revealed that the lenses are identical in the same aperture ranges, though I think the larger fixed aperture of the f/2.8 has the bigger advantage when shooting in low light conditions, which I often do. The lens is a bit heavy, but can be handheld. Because of the weight, I opted to get the IS version instead of the non IS one. I have used the lens in live band shows and it reveals excellent images at 70mm up to 135mm, though I agree with most reviewers, that it is a bit soft on the 200mm range. All in all, It has big advantages over this other brothers (Canon f/4, or the non-IS) , though I cannot compare it with other third party lenses (Sigma, Tokina, Tamron). The only drawback would be it's weight.

The lens is almost un-noticeable mounted on my Canon M50 camera. Fast f/2 aperture performs excellently in most, if not all conditions. I use it extensively for product when photographing for online sales on eBay and FB Marketplace. It provides sharp, well lit photos with amazing detail for the price. Have yet to find a photography genre where it could not do the job. Yet to try it for video but I'm sure it will cope well. I am a photographer and have many lens to choose from, but this little gem has fast become my day-to-day go to. Sensational value and such a step up from the kit lens.

Very good lens. Canon quality and great for low light since the f1.8 aperture lets in so much light. Well worth the money. I gave this 3 stars for portrait photography simply because I prefer 100mm for my portraiture.

I have to hand it to canon. The M3 is fantastic. I used to be impressed with the T3i and the SL1, but the image quality of the m3 is the best canon camera I have owned. The body is compact, and has an excellent and intuitive layout. The Fold out screen is great for high or low shots including (shudders) Selfies. The best part of the camera, is that with a few inexpensive adapters, I can use nearly any lens ever made. It has revived my relationship with my old manual focus lenses. I have even started perusing thrift shops and have struck gold, finding 2.8 and faster lenses for less than the price of a good burger. Heres what I like and don't like about the camera.Pros:- small size,- good button layout for quick access to most used items - exposure compensation, manual focus zooming,- solid build construction- Wireless image transfer to Iphone ( no wifi network required, but wifi on phone needs to be on)- rapid shutter response times 3 times faster than SL1.- ability to adapt manual focus lenses without extra glass ( FD mount, Nikon mount, pentax mount, screw mount)- Amazing image quality- Focus Peaking when manual focusing is spot on.- Half the size of the SL1- Large screen is easy to see and does reasonably in the sun.Cons- slow focusing with USM and Standard Focus motor lenses (all older technology) I was really disappointed, but not surprised. The hybrid focus system used with the M3 is better geared toward STM system lenses. You will notice a difference compared to just about any of canon's other SLRs and it may be due to the adaptor.- slow start times - 2x as long as the SL1- adapters needed for everything - you need them for every kind of lens you mount to them. the canon eos to M adapter is 200$, the Photodiox one is excellent for 40$- sometimes it's too small. the menu button gets pressed a lot if I am using a large lens.- Heavy. - is half the size of the SL1 and weighs just as much even though it has less going on inside. but is made out of better material.- Screen does well in the sun but can be difficult to see if there is glare.Overall this camera is 4 out of 5 stars. It is everything I wanted from canon except speed.Image included to show the incredible detail and color. It was shot with a 55-250 IS lens with no post processing.

The walkaround lens. This very topic leads to a heated discussion among DSLR photographers.First, determine your budget, focal length, and aperture needs.If you frequently find yourself zooming out to get everything in a frame, you will want a wide angle lens such as this. If you frequently find yourself zooming in, this is not the lens for you. On a full frame body such as Canon EOS 5D, this lens becomes ULTRA wide angle. On an APS-C crop body such as Digital Rebel XTi (which I used for this review), it becomes MEDIUM wide angle. But thanks to 1.6x crop factor, this lens expands to more usable 35mm equivalent focal length of 27 to 64mm.Second, audition the lens if you can.By definition, a walkaround lens should be relatively portable. At 1.1 lbs., Canon's EF 17-40mm f/4L USM is neither super light nor neck breakingly heavy. In fact, it weighs almost the same as Digital Rebel XTi -- really nice balance. The lens feels very solid with supreme build quality that only L-series lenses offer. Although this lens is weather proof and therefore sealed against liquid and dust, I strongly recommend getting a 77mm filter to protect the front lens element. With it, this lens is made to last.In terms of looks and feel, it doesn't get much better. Its rubberized full-time inner focus manual ring USM focuses smoothly, quietly, and quickly. Since it's inner focus, the lens will not extend beyond its metal casing whether you zoom in or out. The focus window shows focusing distance from 0.28 meter (0.92 feet) to infinity. The focal length marker indicates 17, 20, 24, 28, 35, and 40mm. The lens exudes quality from tip to tip.You may tolerate heavier lens or may not mind lesser build quality of cheaper lenses. A walkaround lens will be used very often, so make sure you will be comfortable with it.This lens is famous for saturated color and deep contrast. Its images are simply stunning. At 17mm wide angle, barrel distortion is noticeable but relatively mild. From 24mm to 40mm, its images are distortion free and perfectly suited at capturing people.Vignetting (corner darkness) is minimal with mild chroma abberrations (color shadows). At f/4 aperture, details become noticeably softer toward the edges. The center region is very sharp and at f/5.6, edges remain fairy sharp. Thanks to 7 diaphragm blades, this lens can produce very nice bokeh at 40mm (blur effects).One of the most cited weaknesses is the f/4 aperture. In my experience, a bump in the ISO speed and steady hands are all you need to take well focused images indoor. On the other hand, if you are shooting with very little amount of light, you might wish for f/2.8 or image stabilizer. Although the difference between f/4 and f/2.8 is just 1 stop, my other lens, Canon EF 24-70mm f/2.8L USM (too heavy to be my walkaround lens) easily outperforms in such challenging situations. But by and large, I was not handicapped by the f/4 aperture.Some of the main competitions (sorted by price):- Sigma AF 17-70mm f/2.8-4.5 DC macro: Good zoom range with macro, and generally solid performance if you can get a good sample. It does suffer from a bit slow focus mechanism, soft corner, and chroma aberrations. Works only with EF-S mount.- Sigma 18-50mm f/2.8 EX DC: Very good value for f/2.8 aperture, but Tamron's 17-50mm is a bit better lens overall. Works only with EF-S mount.- Canon EF-S 17-85mm f/4-5.6 IS USM: This "traveler's lens" has a wider focal range than most wide angle lenses (widest among Canon) and is equipped with an image stabilizer. While it is a Jack of many trades, it is the master of none. Every lenses on this list will perform better at particular focal length. Then again, none of the lenses on this list has as wide focal range. It is famous for extreme barrel distortion at 17mm and chroma aberrations. Works only with EF-S mount.- Tamron SP AF 17-50mm f/2.8 Di II LD Aspherical (IF): This is the most direct competitor. It takes sharper images with faster aperture while costing less. Both the build and focus mechanism are significantly worse, but should be good enough for many. Works only with EF-S mount.- Canon EF-S 17-55mm f/2.8 IS USM: This is THE reference, if you can afford it. Its images have razor sharp details and great performance all around (minus vignetting, which is typical of EF-S lenses). The build quality is worse than L-series but still pretty good. Works only with EF-S mount. This is the best EF-S lens hands down.- Canon EF 16-35mm f/2.8L USM: One of the most expensive wide angle zoom lenses. It's larger and heavier, but has f/2.8 aperture.This is how Canon EF 17-40mm f/4 USM stacks up.Pros:- Among the very best build quality.- Excellent, buttery smooth, super fast front-focus system.- Top notch color and contrast. Very sharp center resolution.- Almost non-existent vignetting, generally low distortion, and well controlled chroma abberrations.- Ideal weight and size for walkaround purposeCons:- Edge softness at f/4 aperture.- Narrower focal length than most competing lenses.- Slower than some third party lenses.All in all, this is an excellent wide angle walkaround lens. It may not offer the most bang for the buck, but if you value full frame compatibility (EF lens mount) and excellent build quality, this is the default choice. This lens comes with a nice pouch and a lens hood. I find the hood to be somewhat ridiculously shaped and because the lens is resistant to flare, I do not use it often when shooting outdoor.