Although this lens is considered as ultra wide lens, for XTis and 30D's, this is really a 28-65mm lens (not "ultra" but regular wide). I purchased this for about $700 at Amazon to replace the kit lens 18-55mm the XTi came with. I am very pleased with the photos that I am taking. The focus is quick. The images are sharp, and the color is beautiful. I like the lens a lot. Because it's a F4 lens, I do need to use the flash. With 430EX flash I am getting pleasing shots in low light situations as well. I suppose a lower F stop might be better but I don't think Canon makes a lower F stop lens of comparable build. I did consider 28-70mm F2.8L (45-112mm on the XTi), but then it's no longer a "wide" angle lens. Compensating for the crop factor, getting a wide angle lens meant 17mm or less. So, this was really the only choice I had for an L quality build at this price range. Over all, I am very satisfied with the build quality and the results. The 40mm (64mm on the XTi) is a bit short, and I wish it were longer. However, giiven that this lens costs only (did I say "only?" lol) about $650, I have no complaints about the lens. Something's gotta give. It's weight is nicely substantial (not too heavy), and since I use my XTi with a battery grip all of the time, the combined weight balances well in my hands. To me, the battery grip and this lens are perfect companions to make the XTi's complete. I like this 17-40mm f/4L USM Wide Angle Zoom Lens for my XTi.

I was a little worried about not being a f2.8 but for landscape but I use a Tripod 98 % of the time anyway. This was my thought process along with a savings of over $300 when I purchased this lens. But I used the lens on my last trip to Yosemite and I could not be more excited about the quality and clarity of my photos. The f4 worked great and I cannot make one negative comment at this time. Great lens , great price.

ネックストラップも所持していますが、本製品のみを常用しています。SONY α７Ⅲ+タムロン28-75mmを主に使っていますが、１ｋｇを超える組み合わせでも全く不都合なく使用できます。個人的意見かもしれませんが、腰につけたほうが圧倒的に疲れを感じにくいと思います。

Amazing for the price ! Packaging is decent ! I used this for a Sony 28mm f2.8

I ordered the 52mm filter because the 30mm f1.4 sigma lens for sony e-mount cameras has a 52mm thread but after lens arrived, I couldn't fit it on.But after-service support was pretty helpful in telling me this

Great lens ! Sharp corner to corner from f2.8. no backfocus, to cheap not to buy !

[For unclear reasons this review and all others for the Mark I lens have disappeared, I'm re-posting mine]I purchased this lens about 8 months ago as my first "L" glass - since then I have added the 24-70 f2.8 Canon (without IS) to complete the range 24-200 mm at f2.8. I really can't say enough good things about this lens, though in retrospect I might have bought the 24-70 first as it is a bit more versatile. The build quality is terrific and the IS is VERY helpful especially at the longer focal lengths. The f2.8 also allows you to get a teleconverter to double it to 400 mm (though I don't have that as of yet). Though I'm sure the f4.0 is a great lens, the extra stops on this lens allows you to take existing light pictures in amazingly dim conditions. One of my primary uses for this lens will be school programs as it will allow pictures without flash in many of those conditions (especially after a body upgrade to push the ISO a bit - but that's another story). This is the type of purchase that changes the level of photography you are capable of. If you can afford it, you will be very pleased with the results and will have a lens that will likely be a mainstay of your equipment likely for decades. Other reviews have noted that this lens turns heads / looks impressive and that is true though I don't think that is a reason to get it - the quality of the pictures is the big payoff.I decided to write this review after hearing that they are coming out with the Mark II version of this lens with "fourth generation" IS and an additional set of lens elements that are supposed to further improve the picture quality. Honestly, I don't see how further improvement in image quality is possible after seeing what this bad boy can do. The modified IS is supposed to allow for an extra stop or two as a hand-held lens which is nice if you are really shaky but I doubt will really improve things much - of course IS is really a "portable tripod" and does not allow additional stops for subjects in motion. IMHO the IS on this lens is more than sufficient for the task and no modification is needed. As I understand it, the Mk II may be priced around $2400. I hope that they keep producing this "Mk I" lens since my advice would be to buy this one and use the money saved perhaps for a prime lens or the aforementioned teleconverter.ADDENDUM: Indeed, the Mark II came out at a pricey $2500. The first 2 reviews for that glass are reportedly people who compare the lenses directly which I cannot do, of course. If I had it to do over again I would still buy this one and perhaps use the leftover funds to upgrade to a T2i body.

Fits perfectly to my Tamron Aspherical 28-400mm lens