Lenses

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Value for money
Overall

Cons: This lens sucks. It's extremely soft. Only when you get very close to a subject is it remotely sharp. I've sent this to canon to rebuild, calibrate, etc. and it's still terrible. It's not completely fair to compare this to a prime, but my 85mm 1.8 is MUCH sharper at f1.8 than this lens is at f2.8. It's also softer than an 18-55mm rebel kit lens. Another con is the backwards zoom, the barrel extends as you zoom OUT and retracts when you zoom in.

Pros: Good build quality. That's about it. And that it has a red ring, some of your friends might be impressed by that.

Summary: I do not recommend this lens. It seems that some users appear to be happy with their copies, but an equal amount are seeing the same issues that I am. I have use the NEW version II of this lens (from borrowlenses) and can tell you that it's absolutely amazing, and worth the extra price. Prime sharp at 2.8, at all focal lengths.

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Cons: Dustbin size lens hood

Pros: Excellent IQ, build quality

Summary: On my camera except when outdoors

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Value for money
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Cons: The outer deteriorrated after while shame for L lenses corners extremely unsharp for this level of lens

Pros: centre performance is spectacular

Summary: sold straight away as performance was not acceptable for my purposes

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Cons: No IS, heavy slow focus. Quality varies need to check back focus.

Pros: Overall good lens range.

Summary: No IS, heavy slow focus. Quality varies need to check back focus. Try several lenses to get one that focuses correctly.

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Optical quality
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Cons: 1) Heavy - definitely noticeable on a 450D. 2) Field curvature might be an issue

Pros: Excellent image contrast and colors. The IQ is very good

Summary: This is my workhorse lens, which I use as a general purpose zoom. It takes excellent pictures, and I've been very happy with it. Although it's heavy, it works very well for my needs, anyway.

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Overall

Cons: too expensive

Pros: very sharp, very good focus, 2.8

Summary: would be a wonderfull lens if the price would be 250 less

Build quality
Optical quality
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Overall

Cons: Heavy;

Pros: Great IQ; versatile; quick;

Summary: My go-to lens - always on the camera

Build quality
Optical quality
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Overall

Cons: it is big and heavy but I'm not complaining one bit. It would be nice it is was a bit less expensivebut you do get that you pay for.

Pros: IMAGE QUALITY! fast AF accruate AF (to me that is just as important as the speed of the AF if not ever more important) Manual AF is nice and easy to use.

Summary: Honestly this is one very increadable lens in every aspect. Yes it is heavy, Yes it is big but those two problems pretty much just disappear when yopu are using the lens. it is a very ewasy lens to handle even for a long period of time. it remains sharp no matter the setting you are using and it is as sharp as pretty much any prime once you set to f-stop to 4.0 or over (seriously this lens is sharp) Also it has one very cool feature. the lens actually extends when you are at the widest setting. This makes the lens hood very useful as every zoom setting, not just the widest setting like most every other zoom lens. Also I know that many people find this lens expensive, but trust me that money is well spent in this lens. Note: i have been using this lens on two ASP-C cameras, a 40d and a 7d.

Build quality
Optical quality
Value for money
Overall

Cons: it is big and heavy but I'm not complaining one bit. It would be nice it is was a bit less expensivebut you do get that you pay for.

Pros: IMAGE QUALITY! fast AF accruate AF (to me that is just as important as the speed of the AF if not ever more important) Manual AF is nice and easy to use.

Summary: Honestly this is one very increadable lens in every aspect. Yes it is heavy, Yes it is big but those two problems pretty much just disappear when yopu are using the lens. it is a very ewasy lens to handle even for a long period of time. it remains sharp no matter the setting you are using and it is as sharp as pretty much any prime once you set to f-stop to 4.0 or over (seriously this lens is sharp) Also it has one very cool feature. the lens actually extends when you are at the widest setting. This makes the lens hood very useful as every zoom setting, not just the widest setting like most every other zoom lens. Also I know that many people find this lens expensive, but trust me that money is well spent in this lens. Note: i have been using this lens on two ASP-C cameras, a 40d and a 7d.

Build quality
Optical quality
Value for money
Overall

Cons: Big and Heavy

Pros: Very good image quality, even wide open. works well on APS-C cameras also.

Summary: This lens has impressed me greatly and I demand a lot from my equipment. It is pricy but worth it. Very good for portraits and weddings.

Build quality
Optical quality
Value for money
Overall

Cons: weight, huge hood, price

Pros: Image quality, silent

Summary: It's clearly a professional lens. I got very very satisfied by image quality. It makes persons beautiful than they really are, I swear it. It's huge but it's my default lens always attached to my camera. Good also on aps-c cameras