Great camera. I use it with a 22mm f/2 lens EF-M lens and this is a fantastic combination which produces absolutely stunning images and the whole set up fits into my pocket. I compared M3 with 22mm f/2 lens against my full frame 6D with 17-40 f/4 lens set at 35 mm. I sold my 17-40 after that. The crop sensor M3 with 22/2 wide open produced at least as good images as my 17-40 set at 35 mm at f4. Of course, the 17-40 is a zoom lens and you have an option for incredibly wide 17mm shots. But M3 + 22/2 is a stunning combination.I have read that autofocus of M3 is not good, and that is partially true. However with the native EF-M 22mm f2 lens, autofocus is very fast and accurate. I was able to get well focused shots on the street while walking most of the time. So it's very fast and accurate. I have really no complaints at all about aufocus speed with this lens. My 100mm f/2 worked with M3 great as well. However, my 400mm f5.6 lens focused extremely slowly with M3. The same goes for my 80-200/2.8 lens. Usable only for static subjects.Regarding image quality, it is a good as it gets for a crop sensor camera from Canon. There's nothing better from Canon. There's not much to say except that is great. It's Canon and that says everything. High ISO performance is great for a crop sensor camera. My 6D (full frame) is better obviously because of full frame. But M3 performs really solidly at high ISO. Colors are great as in all Canon cameras. Dynamic range could be slightly better at base ISO, but as soon as you increase ISO to 1000 or above, it is the best in its class. When I say dynamic range could be slightly better at base ISO, this doesn't mean it's bad. It's great, but there's room for improvement. That's all.This camera really shines with the 22mm f/2 lens, and in my view it's worth buying this camera only so that you could use this lens. With this lens, M3 is perfect for street photography. Light, compact and with image quality comparable pro grade L zoom glass on full frame. Last, but not least, it's cheap.

Let's be clear, this is NOT the best 50mm prime you can get. It's not even great in comparison to them. Arguably, that crown sits atop the new Sigma 50mm F/1.4 Art. Having used the sigma a bit (admittedly, not a lot), it's at least 200% better. Maybe 300% or more, but you'd have to be really adamant about some of the particulars. Make no bones, the Sigma is a tremendous lens. The thing is, it's also an absolute STEAL compared to the former champion, the Canon 50mm 1.2L, $400 more expensive at $1350. If you're following the math, I'm saying this lens is possibly 1/3 as good as a lens that costs nearly 8 times as much, and is already a bargain at that price. There's a reason it's the best selling lens on the market, for any camera system.Yes, your kit lens has 50mm in its range. But F/1.8 opens a whole new world of artistic expression for the beginning or intermediate photographer over the F/5 or F/5.6 that lens opens to at 50mm, and for the price, you'd be insane not to go for it if that even interests you in the slightest. And if $125 is too much to ask for your budget especially if you're a student, get a body $125 cheaper to make room for this lens.

Excellent protection for a 105mm f2.8 Nikon.. It has taken a solid whack, the lens is unscathed, and curring UV is helpful..

The Canon EF 70-200mm f/2.8L IS USM Telephoto Zoom Lens is nothing short of incredible. I'm using it on my Canon XTi. With the XTi's multiplication factor of 1.6 the effective focal length of this lens is 112mm to 320mm. The thought of a 112mm to 320mm lens which features a maximum aperture of f2.8 throughout its range and has image stabilization is hard to comprehend at first. After a couple weeks of use, I find this lens is fast, sharp, quiet, and a bit heavy. This lens is fantastic for portraits. It's also great for close-ups taken from about 5-6 feet away. It's far more versatile than I expected.

The newer version of the Canon 50mm F1.8 lens, autofocus, very sharp, and can focus very sharply. Good use for taking portraits on my T5 crop sensor camera.

I've been using this camera for around 2 years and I love it, I use it with a canon 17-40mm f/4 and the pictures are really sharp!. I would't recommend the kit lens though (17-55mm f/3.5-5.5 I think).

Having owned the distortion-prone Nikkor AFS 17-35 f2.8D for six years, it was time to switch over to Canon's EF 17-40 mm f4L USM. Canon's version was over a $1000 cheaper, optically superior and lighter in weight. For me, an outstanding standard lens when coupled with the Canon 5D.Vignetting at f4 is minimal. Adobe Photoshop CS2's vignetting tool can correct the vignetting.Distortion at 17mm is minimal. Less than Canon's EF 16-35 mm f2.8L USM set at 16 mm.With the 5D pointed at a blue sky, the EF 17-40 hunted for a focus point while the EF 16-35 didn't.Flaring is minimal when compared to the EF 16-35.Portraits taken at 40 mm produced better results than the EF 16-35 and AFS 17-35 at 35 mm.Images produced at f4 are sharp. At f8, the images are very sharp.This lens is a definite keeper.UPDATE (13-July-2007): Please see some of the images taken with this lens.

I always wonder about this lens and weather I should get it or not. I have 24-70mm f/2.8, which covers quite versatile focal length, and always thought difference is just 7mm, which I thought it would not make a huge difference. I was so wrong! Compared to 24mm, 17mm on full frame camera is quite a big difference and 7mm difference is significant. The widest aperture is f/4 for this lens but this lens pick up the light, even the slightest, very well. The image quality is excellent. What surprised me most is how light this lens is. Maybe I'm used to have extra heavy lens like bazooka and the above zoom lens, but this is as light as my 50mm f/1.4. This makes this lens quite a great travel companion. Very sharp, light, fairly compact with versatile wide angle zoom. The used price on these lenses are totally worth to spend.