Lenses

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Cons: Can have terrible purple fringing in high contrast conditions. Would be good if the next revision of this lens was weather sealed.

Pros: Sharp, very sharp. Useful focal range. Fast enough. Very cheap.

Summary: A great value kit upgrade and walk around lens. It's on my K-5 most if the time. When it gets dusty or damaged I get a new one. My latest Chinese made copy is actually very good and as good as my last Made in Japan copy.

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Cons: lack of image stabilization AF is somewhat slow

Pros: f 2.8 over the full range quite lightweight somewhat limited range

Summary: great value for the price and a huge step forward. Although I would wish for a bit more reach on the long end, maybe up to 70mm

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Cons: slow/noisy auto focus, AF hunts in low light (like all lenses), CA at wide end.

Pros: f/2.8 all zoom range, nice colors, good IQ (image quality), SHARP, nice bokeh, compact, light, cheap.

Summary: yes, I have a new copy, this one it's sharp.

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Cons: soft, CA at wide end, slow & noisy AF

Pros: f/2.8, good color rendition, nice bokeh

Summary: Maybe I was "hit" with a bad copy of this lense, because is everithing but sharp.

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Cons: Doesn't have full time manual focus, AF is not so fast, focus ring turns during AF.

Pros: Great image quality, improves a lot in the long end stoping down to f/3.2 or f/3.5. Good body construction in the price range.

Summary: A good upgrade over standard kit lens (18-55). Lower cost doesn't mean low quality in this model. Recomended.

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Cons: quite slow autofocus (i think worst than canon18-55is) and not so perfect. at f 2.8 no good quality image in the center between 40-50mm, no stabilisation

Pros: aperture 2.8 works very good between 17-30, good grip in hand (manual focus to), good value for money (build quality, 17mm, f2.8, lens hood included)

Summary: For the price I payed I get a very good lens, not perfect but for what I need is good! I think the worst thing is the medium autofocus

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Cons: Loud AF; out-of-focus-highlights tend to show an onion-shaped structure; mediocre bokeh; zoom is stiff and "sticky" - could be smoother

Pros: Sharpness and contrast across the focal range and wide open at f/2.8 (50mm is a little bit softer and needs f/4); "bang for the buck"; AF-accurecy is ok; compact design

Summary: In my opinion the best APS-C fixed-aperture standard zoom in this price region.

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Cons: feels a bit plasticky compared to my 24mm L-glass, AF is a bit louder than Canon's USM drives (but I'll live with it, nothing to complain about, really); front element sticks out a bit (I would recommend a filter, well worth it); chromatic aberration at f2.8 (not significant at f4.0 and beyond)

Pros: LIGHT (this baby is only 430g, love that, bit time!); versatile: I shoot some landscapes, some portraits, this lens does it ALL with relatively good performance on my Canon 7D (I like that!); INEXPENSIVE (compared to some Canon APS-C and L-glass options... com'on Cannon! when I see a lens like this I realize that you are just gouging my pockets with your models.... 1000USD for the 17-55 f2.8 IS... seriously... get real! This lens beat it at 1/2 the price = #WINNER!!! (that's 'you loose' in twitter speak :)

Summary: if you're reading this you know what to do, BUY MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

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Cons: Slightly inaccurate + Noisy AF Feels Plasticy, comparable to Canon kit lens build quality High distortion on 17mm

Pros: Very Sharp Minimal Vignetting Exceptional performance at 24mm up to 35mm

Summary: Worth the money, great walk-around lens. Very sharp, which is the most significant value in the end. Would definitely recommend to a friend

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Cons: Poor build quality & AF accuracy, soft in wide open

Pros: Good price, Nice image but you must stop down to f4

Summary: Don't think about it, just take the picture

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Overall

Cons: Slow and noisy AF. No IS.

Pros: Sharp in wideopen. Cheap.

Summary: Good lens in range 17-50mm. Best for Pentax, sony.

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Cons: relatively slow and very noisy AF, not very tough build quality, focusing ring rotates during AF

Pros: PRICE, optical quality - sharp from wide open, nice colours and contrast, internal focusing, very good bokeh

Summary: "cheap" standard zoom lens for everyone, performs as it had hidden L-grade canon glasses inside :), almost as sharp as canon 17-55 which costs more than 900EUR. Ideal lens for shooting where you do not need extremely fast AF (all but sport)

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Cons: no af override(sadly), no stabilization, only for DX af ring gets a bit in the way

Pros: The best PRO wide zoom in my bag! forget the nikons!forget the 17-55!forget the sigmas! i've checked and tried everything in the 24-70 equiv. range,as i use it a lot,and if you have any doubt go straight here.Nice handling,SUPERB image quality,decent at 2.8 and look what happens if you close it a bit to f/3.5-5! Even distortion and vignetting -if not corrected in post production,camera raw has a profile for this lens- manage to look pleasant,like 1-2 thousand euro nikon lenses(which i've got)!

Summary: Need a zoom in the 17-50 range?go get it. Don't confuse this gem with the poor VC version. This is not a great lens "for its cheap price",this is a great lens,this is THE lens to buy in that range.End of the story.

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Cons: AF loud and slow, random accuracy, wide open soft

Pros: you can take pictures

Summary: i sold the lens

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Cons: Smearing at the extreme edges, soft wide open(no big surprise there), AF hunts in low light

Pros: Light, Sharp at f4, low flare, low CA

Summary: An enjoyable lens, practically glued to my camera for the last year. For a zoom at this price it is an excellent value. The AF is sloppy compared to the EF85 1.8 USM, but is better then the EF50 1.8. Bokeh is a bit harsh, out of focus circles have a hard edge to them.

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Cons: Excellent image quality. Very sharp from f4.0. It makes your prime lenses redundant! Very light lens.

Pros: No image stabilizer

Summary: This is one of the best lenses for the cropped sensor cameras. Great resolution and rendition of colors. This is the best value lens for your cropped sensor camera

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Cons: a bit soft at 2.8, at Canon a bit dull colours, focus dizzy

Pros: sharp, prize, nice allrounder

Summary: Iam using this good lens with my Pentax K 20. I bought it used for 220€, so a big deal. Before I used the same lens with Canon, but I sold it, because it produced dull colours (Canon only produce nice colours with L-glass or the 10-22+15-85). Very sharp, good corners, few CA´s and few vignetting.

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Cons: none

Pros: sharp ,f2.8,good color rendition, good value, reasonably quick accurate focusing and a little buzzy ( so what ),accesable manual focus ring,

Summary: you can spend 3x as much on a canon and get similar performance. IS model of tammy may be an option for $200. upgrade over kit,good focal length to go with 55/250 canon and a super wide. on crop body good portrait length

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Cons: very slow focus

Pros: yery sherp

Summary: yery good walkaround lens for APS-C

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Cons: slightly underwhelming build quality, a bit noisy, af/mf switch small and inconveniently placed, distortion @ wide end, and focus ring sometimes touches finger because it's so close to the zoom ring.

Pros: wonderfully sharp for the price, small & lightweight for being a fast lens, no lens creep, and great contrast + saturation of images. f/2.8!

Summary: (on a nikon d90) I LOVE this lens. i opted to forego the kit lens on the D90 for the increase in f-stop and am very happy with my choice. the cons listed are EXTREMELY minor and I got used to them within a few weeks; especially when i figured in the money i saved compared to a brand name lens. This is the perfect starter lens / walk-around lens for DX bodies and is the lens on my camera 80% of the time.

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Cons: Autofocus is rather loud, not fully recommended for wedding photographers. Not weather sealed (but cannot be expected at this price tag!). Slight vignetting, but not disturbing.

Pros: Very sharp images, good for low-light shooting, good built quality, extermely cheap for what it offers

Summary: Highly recommended Lens for Canon 1.6 crop camera owners. There simply ain't any better "standard lens" for the EF-S mount available... yet.

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Cons: Some visible chromatic aberrations at wide angle. Autofocus is quite loud with its high-pitched buzz

Pros: Very sharp from f/2.8, fast autofocus (seems slower than it really is because it's quite loud) Good build quality, nothing is loose, nothing wobbles.

Summary: Excellent lens for APS-C, sharper than even Canon 17-55 f/2.8 Very nice design :) Oh, and it comes with a lens hood.

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Cons: cons

Pros: pros

Summary: summary

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Cons: Blokeh not that smooth

Pros: Great in low light Scharp

Summary: This is a good lens, good build quality (although could always be better = als heavier).

Build quality
Optical quality
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Overall

Cons: Awful distortion at wide end. Slow, erratic focus (sometimes).

Pros: Very sharp, even wide open. Perfect size/weight. Overall, excellent value for money.

Summary: Perfect walkaround lens for APS-C sensors.