Canon 17-55mm f2.8 EF-S IS USM review  Hot

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Lenses Canon EF / EF-S
User rating
4.4
out of 5
Editor's rating
4.3
out of 5
Lens Summary

Overview

With a constant f/2.8 aperture throughout the zoom range and a 3-stop Image Stabilizer, the EF-S 17-55mm f/2.8 IS USM provides outstanding performance and framing flexibility in low light conditions.

 

Features

 

Change your view. Not your aperture.

 



High performance wide angle zoom
With an effective Focal length range of approximately 27-88mm (35 mm equivalent), the EF-S 17-55mm f/2.8 IS USM is a powerful lens that delivers remarkable image quality. The wide angle zoom allows you to capture more of every scene and add a new sense of space and perspective to your photography.

Fixed aperture
The large f/2.8 aperture provides excellent results in low light conditions. The aperture remains constant through the full focal length range, allowing you to zoom from approximately 27-88mm (35 mm equivalent) without slowing shutter speed.

Pleasing background blur
A circular aperture provides a pleasing background blur when shooting with a wide aperture; ideal for creating a sense of depth and isolating your subject from the background.


Image Stabilizer
The EF-S 17-55mm f/2.8 IS USM features Canon’s 3-stop Image Stabilizer (IS). Ideal for handheld work, IS allows use of shutter speeds up to 3 stops slower with no perceptible increase in image blur. IS helps with low light conditions, fast paced scenes and shooting from moving vehicles.

Fast, quiet auto focus
A ring USM (Ultrasonic motor) uses ultrasonic frequency vibrations to drive responsive, near-silent high speed auto focus. Good holding torque stops the focusing lens group with precision without overshoot. Full time manual focus override is available without having to switch out of AF.

Super Spectra coatings
Optimised Super Spectra lens coatings and lens element shaping suppress flare and ghosting - more prone to occur with digital cameras due to Reflection off the image sensor. Coatings also help achieve true colour balance and increase Contrast for vivid hi-fidelity images.

Passes distance information to E-TTL II
The lens passes distance information back to the camera's E-TTL II flash system to ensure optimal flash metering in any shooting situation.

Lens Specifications

Generic Lens Specifications
Lens Type: Zoom
IS / VR / OS: IS
Min Focal Length (mm): 17
Max Focal Length (mm): 22
Number of Elements: 19
Element Groups: 12
Max Aperture: 2.8
Minimum Aperture: 22
Diaphragm Blades: 7
Closest Focus Distance (m): 0.35
Maximum Magnification: 0.2
Filter Type: Screw In
Filter Diameter (mm): 67
Diameter at widest (mm): 78
Lens Length (mm): 92
Weight (g): 475
Available Mounts
Mount: Canon EF-S
Accessories
Lens Hoods: Canon EW-83-J

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Editor review : Canon 17-55mm EF-S IS USM
Overall rating (weighted)
4.3
Sharpness
4.0
Build Quality
5.0
AF Speed
4.0
Value for Money
4.0
Being an EF-S lens, the 17-55mm will only work on a EF-S compatible bodies like the 30D and 400D. The optical performance is very impressive.

(more in-depth review coming soon)
Why should you care what I think?
My relationship with this item: I have borrowed a friends
Where did you buy this item?: N/A
Price paid: 0
When did you buy this item?: N/A
Conclusions at a glance
Would you recommend this Item: Yes
Pros: Great Optics, well built
Cons: Only fits canon EF-S bodies

User Lens Reviews

Average user rating from: 54 user(s)

Overall rating (weighted)
4.4
Sharpness
4.5
Build Quality
4.5
AF Speed
4.3
Value for Money
4.2
 

Add new review


0 of 0 people found the following review helpful

17-55 IS f/2.8 Very Happy, Tuesday, 17 June 2008


Overall rating (weighted)
4.3
Sharpness
4.0
Build Quality
4.0
AF Speed
5.0
Value for Money
4.0
Just came back from picture taking in Italy. Worked great indoors and out. I am happy I purchased this over the 17-40. Indoors f/2.8 and IS are great combinations. I also have the 18-55 IS lens and this suprised me on how well it worked. The first day I used this and it worked great outdoors. The second day I knew I would be shooting indoors so I used the 17-55 and it stayed on the camera for the rest of the trip. Very happy with this lens
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1 of 1 people found the following review helpful

A great alternative to the Canon 24-70mm f/2.8L le, Thursday, 15 May 2008


Overall rating (weighted)
5.0
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
5.0
Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras

I use this lens mostly for existing light interior photos and portrait photos. (It does work well with strobes in a studio setting too.)

Between the fast, constant aperture and the IS system, you get great low-light capability.

It's as sharp as my 50 1.4 but more versatile for use in group portraits.

It appears to be at least as well-built as the 40D/30D I use it with.

It is expensive, but it is really the best thing you can hang on a Canon crop frame camera. If you intend to go to a full frame format at some point then this will not be the lens for you and you should look into the 24-70mm L lens.

Pros: Smooth bokeh, Fast, Sharp, Versatile

Cons: fairly large & heavy (but not as heavy as the 24-70), Hood has to be purchased seperately

Best Uses: Portraits, Night/Low Light Photography, Travel Photography

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0 of 1 people found the following review helpful

Canon 40D + 17-55 2.8, Friday, 09 May 2008


Overall rating (weighted)
3.0
Sharpness
3.0
Build Quality
3.0
AF Speed
4.0
Value for Money
2.0
OK. Last week I bought "kit" - Canon 40D with 17-55 2.8 IS

This tandem is superb, well built, looks great...but

My lens had front focus. Very strange, because I bought body with lens together in one box. When I was shooting portrait photo and set focus on model's eye, the focus was set on nose or blouse which was placed nearer.

Last friday I went to shop in which I bought this "kit" to change body/lens to get perfect photos. Unfortunately not a single one combination satisfied me. I've tried 3 17-55, one Tamron 17-50 2.8, one Canon 100 2.0 and 5 Canon 40D bodies. Every combination had front focus.

I returned "kit" and thought about buying Canon 5D with 24-70 2.8, but... I don't want any problems with focusing anymore (especially that this bodies/lenses aren't cheap)

Now I consider (and I'm sure) to buy Nikon D300, which has focus adjustment in body.

I don't say Canon is a "piece of s*" Perhaps I didn't had a luck, but it's really annoying go to shop and spending six hours there, trying different combinations and not a one is OK. Thank you very much CANON for such surprise.
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0 of 0 people found the following review helpful

Was a great lens for the price..., Sunday, 06 April 2008


Overall rating (weighted)
4.3
Sharpness
4.0
Build Quality
4.0
AF Speed
4.0
Value for Money
5.0
This lens was a great lens on a crop body (like the 30D) for the money. Even though it's not an "L" lens, it's still very sharp, and the 2.8 and IS are great for low light photography. The only downside was the build of the lens. It tends to break easily, and for no reason, but Canon is very good at fixing it quickly. Now, though, the price of the lens has just about doubled for some reason, and I definitely wouldn't recommend buying it while Amazon is selling it for $1700. Wait until it's less than $1000 again, because it's not worth it until then.
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0 of 0 people found the following review helpful

Too good a lens, Monday, 31 March 2008


Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
4.0
I bought this lens upon recommendations and have never regretted despite its hefty price. This lens take such sharp images on my Canon 400D and even in low dim light, I could capture sufficient quality images without even employing a flashlight! It's now my everyday lens. Only setback for a lady-user like me, is the lens is rather heavy on my small 400D body. But then I just need to practice holding it real steady eh.
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0 of 0 people found the following review helpful

answers to a few concerns, Monday, 24 March 2008


Overall rating (weighted)
4.3
Sharpness
4.0
Build Quality
4.0
AF Speed
4.0
Value for Money
5.0
i'll review the top concerns that the general norm has on this particular lens.


dust - i have no dust for a month of use both indoor and outdoor. previous copies may have been problematic with dust seal? i dont know why some report dust issue. but i sure do not have dust problem. i just received my b+w uv filter to protect the front element so i advise that you get it for double protection.

efs lens life - if canon is smart and im sure they are very smart people. they would not just end supporting the general consumer who can only afford cropped bodies over their full frame offering. there is no end for cropped bodies and continued support is a given.

price - yes it is expensive but for cropped body, at 2.8, and IS, we sure are at the mercy of canon. fyi supercoupons at another big camera store in NYC can often get you this copy for $854.

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0 of 0 people found the following review helpful

Best crop lens on the market, Tuesday, 18 March 2008


Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
4.0
This is lens is very sharp! The range is excellent and the IS is awesome! There is no better lens in this range for a canon's crop cameras. I use this lens for events and it never disappoints.
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4 of 4 people found the following review helpful

My rant, Tuesday, 18 March 2008


Overall rating (weighted)
5.0
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
5.0
Ok if you're like me, you've been reading review after review on this lens. And if you're like me, you're getting sick of reviews that point out the obvious faults with this lens, over and over again.

Here's one. "This lens is an EF-S and it only works with a 1.6 crop body wah-wah-wah!" OMG! If I didn't own a Rebel, 20D, 30D, or 40D, I wouldn't even be shopping around for this! "But if you upgrade to a full frame body this lens will be obsolete." Give me a friggin break. If I was going to drop serious coin to "upgrade" to a 5D, then obviously I've got enough dough to get it. Maybe I should save a little more and plan on getting lenses with it too. It's as if they think this lens has a resale value like a Kia. Why couldn't I decide to sell it along with the 40D if I was going to "upgrade" to a 5D?

Here's another. "B-B-But it's a $1000 and it doesn't feel as nice as an L lens." Tell me what L lens you can get that as a usable zoom of 17-55, that's this fast, and has an Image Stabilizer? Well let's see here.. there's the ever so popular 17-40 f/4L but it doesn't have an IS and it only zooms to 40. Even 55 is sorta on the short side. And it's not as fast with an aperture of 4. Next! Ah. The 24-70 f/2.8L There we go. This is WAY better than the 17-55. But wait, at it's widest it's 24mm which on a crop body is actually 38mm. If you're like me, you like to take landscape and group photos. 38mm? Come on! Not gonna cut it. Also, where's the IS?

Fact is. EF-S are a new breed of lenses designed specifically for 1.6x. L's are not designed for 1.6x cameras. And L's have been out a long time so you don't see a good walk around lens with IS. Maybe someday but not now. The closest L in this range is going to be the 24-105 f/4L IS but again it's not wide enough for a 1.6. It's friggin awesome for a full frame and if I ever get a 5D I'd probably get one of these as well. But I wouldn't even consider it on a crop body.

L's are great, fantastic lenses and they have the cool red ring around it that screams, "I'm a professional" but as you can see, they're not designed for 1.6 crop yet. And what professional uses a crop body as their main camera anyways? Right now, the EF-S 17-55 f/2.8 IS USM is as good as they come.

BTW here's another. "The 17-55 is a dust magnet. It's a freaking vacuum cleaner!" Ok.. so Canon spent their $1000 on the glass, IS and plastic. Maybe if they used magnesium and weather sealed it you'd be a happy camper. But would you be happy spending $700 more? How about just $500 more? Maybe. Maybe not because for some people like me, we can live with a lighter lens that needs to be babied a little more. How many people actually have photos with dust showing on them? I've never seen 'em. If so, maybe you should sell that lens and "upgrade".

In the past, people had to "upgrade" due to the lack of lens choices. And Canon knows this. They're not stoopid. They know that if the lens choices grow too much too fast for their "amateur" cameras, then their "professional" cameras won't sell. If you own a 30D or a 40D you know that the body is capable of making you money. Shoot.. even a Rebel XTi is pretty darn amazing. I don't expect Canon to create an L lens for the 1.6x because of their marketing strategy. If they made a fast, ultra-wide zoom w/IS in their L lens.. people will just stop buying 5D's imho. Thanx for reading. Carry on.
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1 of 1 people found the following review helpful

Love It!, Monday, 10 March 2008


Overall rating (weighted)
4.0
Sharpness
5.0
Build Quality
4.0
AF Speed
4.0
Value for Money
3.0
This lens seldom leaves my camera. It is a great walk around lens. The IS and constant f2.8 is what makes this lens. I am very happy with the lens.
Why should you care what I think?
My relationship with this item: I own it
Where did you buy this item?: Henry's Camera
Price paid: 1,099
When did you buy this item?: July 2007
Conclusions at a glance
Would you recommend this Item: Yes
Pros: Very sharp, great brokeh, constant f2.8, IS
Cons: I wish it were smaller, and price
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1 of 1 people found the following review helpful

Fantastic Low Light Lens, Saturday, 08 March 2008


Overall rating (weighted)
3.8
Sharpness
4.0
Build Quality
4.0
AF Speed
4.0
Value for Money
3.0
I just got this fantastic low light lens last week. Will be adding more comments as time permits.

Pros:

No internal dust so far
Very pleasing shots with nice Bokah
Sharp even at F/2.8 zoomed between 20mm and 48mm
Auto focus perfect! Silent quick lock even in dim conditions
Image Stabilization let's you get those shots you couldn't get otherwise.

Cons:

Cheap plastic construction
No dust yet but I am concerned
No included lens hood? Give me a break Canon!
Really poor zoom feel grabs at each end and feels cheap
Front of lens extends inward and outward when zooming in and out
Really soft shots when zoomed to both ends of the zoom especially at 17mm wide open

I bought this lens to take low light portraits during weddings. My initial impression is that this lens will be perfect. I even managed to pull off a 2 second exposure that was pretty sharp hand held which I would never be able to do otherwise. I will use it at the extreme in 55mm for nice bokah and a softer shot then keep it between 20mm to 48mm for the sharper shots.

What a disappointment to pay over $1,000 for a lens and have such a poor feeling zoom. It grabs at each end and just plain feels cheap. Makes my Canon 17-40 F4 L lens zoom feel like it's perfect as it is silky smooth. But, the 17-55 F/2.8 IS does something I could not do with the 17-40. I was at a bar the other night shooting a benefit auction using just available bar light and already at 1600 ISO and the Canon 17-40 wide open just could not get the shot. With the 17-55 F/2.8 IS not only do you have the faster aperture F/2.8 but I can get shot after hand held shot at a half a second something I could not come close to with the 17-40.

All in all though except for the zoom and construction this lens really does rock when you look at the photos. Between 20mm and 40mm it is sharper then the 17-40 at any comparable F stop. So don't let my cons keep you from getting this lens. If you need low light shots in the 17-55 range this is your only option in a zoom. It's a shame that Canon does not offer an L lens that's 17-55 F/2.8 with IS. I would have gladly paid $1500 for an L lens. In the long lens range there are tons of choices from Canon that are L lens. It's true what they say Canon owns the long lens but come up a little short with the wide angles

I do my first wedding next Saturday with this lens, time will tell if it's a keeper. Will post updates in the coming weeks.

3-25-2008 Update

What a great lens, after reviewing wedding photos yesterday with my clients I have to agree the photos just pop in color and the sharpness is crazy with this lens between 20 and 50mm even wide open which is what I shot most of the time. The bokeh though not as good as my Canon 85mm F/1.2 and Canon 135mm F2 is still pleasing and unlike the two primes I can stand in one place during the wedding and zoom in and out for different points of view.

What ever you do don't even confuse this F/2.8 IS lens with the basic kit lens. It is truly except for the lack of weather sealing and poor zoom feel an L lens in photo quality!

4-8-2008 Update

Still no dust thank God! I am taking it to a local park to photograph our company party this weekend and it's very dusty there. Should be a good chance to see if the lens is going to be a dust hog or not. The zoom even seems to breaking in a little and is now just a little smoother, nothing like my L lens zooms but better then when new. Still loving this lens and in fact if I had to choose just one lens to do a wedding this would of course be it, it's the most versatile and easiest to use by far!

5-21-2008 Update

Still NOT one single spec of dust in this lens. I have been using outdoor at the park and on outdoor weddings the last 5 weekends in a row and not a single spec of dust despite being in extremely dusty Mesa Arizona. I am constantly amazed at what this lens can get away with in low light. We were shooting the reception to an outdoor wedding well after sundown and I was hanging in there with my Canon 40D and a 85mm F/1.2 L II at 3200 ISO shooting close ups. My daughter was shooting at the same time covering the wide angle photo ops with this Canon 17-55 F/2.8 IS and was getting shots here and there at 1600 ISO with her Rebel of the crowd as long as people were still even up to the point of a full second exposure. This was well after it was too dark to be taking photos without flash but we were still getting photos (we hate flash too unflattering and flat) Simply AMAZING!


Lens I currently own:
Canon EF-S 17-55 F/2.8 IS Ultra sharp, great colors, great low light, poor zoom action
Canon EF-S 18-55mm f/3.5-5.6 Rebel XTi Kit lens Muddy, slow, pile of junk
Canon EF 17-40mm f/4 L Fantastic colors, pretty sharp, zoom a l, light weight
Canon EF 24-70mm f/2.8 L Fantastic colors and contrast, sharp, zoom a little stiff at first, heavy!
Canon EF 50mm f/1.8 II Good budget portrait lens, light weight, disposable
Canon EF 85mm F/1.2 L II The best portrait lens I own, buttery smooth Bokeh, heavy and expensive it shares sharpness with 135mm
Canon EF 135mm F/2.0 L A great portrait lens and tied with Canon 85mm F 1/.2 for sharpest lens I own, buttery smooth Bokeh
Canon EF 70-200mm f/2.8 L fantastic colors and sharp for a zoom, very versatile ego boosting and attention getting

My next lens purchase I'm saving for right now:
Canon EF 300mm F/2.8 IS L the finest lens ever made by Canon
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0 of 0 people found the following review helpful

Canon EF-S 17-55mm f/2.8 IS USM Lens, Thursday, 28 February 2008


Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
5.0
AF Speed
4.0
Value for Money
5.0
The Canon EF-S 17-55mm f/2.8 IS USM Lens is the top-end Canon EF-S "walk around" lens for the Canon 40D and matches the camera perfectly in terms of quality and performance. My copy appears to have the image quality of Canon's L series lenses, missing only the advanced weather sealing of the pro L lenses. I have seen reports that this lens can gather dust behind the front element, in some cases, but my lens has not suffered this problem to date. I would probably have made the mistake of getting the new image stabilized version of the kit lens, had it been available at the time, instead of this one. That would have been a mistake (except for the large price difference!)- I really love this lens with its constant f/2.8 speed!
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0 of 0 people found the following review helpful

Worth Every Penny, Tuesday, 22 January 2008


Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
4.0
I'll keep this short and sweet: this lens is superb.

Lens clarity and sharpness is spectacular at all lengths. The wide aperture is great for low light shots. Colors are captured wonderfully, as are tones and highlights/shadows. The 7 blade barrel yields wonderfully smooth blurring. The IS is dead-on and solid. Focus is really fast and quiet.

All in all, this lens is the one I keep on most of time when I'm just doing walk-around shooting. I recommend this lens to anyone, and I can assure it's well worth every penny.
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0 of 0 people found the following review helpful

So far, so good, Sunday, 20 January 2008


Overall rating (weighted)
4.0
Sharpness
4.0
Build Quality
5.0
AF Speed
4.0
Value for Money
3.0
I've only shot one job with this lens after receiving it. It was a business function with Steve Forbes and mostly "grip and grins" with flash. It performed very well. Most of the files looked very sharp and comparable to my 24-70 L zoom which I also have. I rarely use any lens wide open and I was usually at 5.6 or 4. Limited tests at wide open (2.8) suggest it is above average at that f stop though not exceptional. I borrowed one of these lenses a few months ago to shoot a wedding reception and also got very good results then. It seems to focus very fast and accurately. As I get older I don't hold a camera as steady as I used to. That's why I bought this lens. My impression at slower shutter speeds is the IS works well. I'm using this lens and my 40D this afternoon on another job and I feel it will perform as well as my Mk II 1Ds with 24-70 L lens so I guess I've decided it is a serious tool. It better be at the price. Anyway - that's an early report.
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0 of 0 people found the following review helpful

Great lense for Canon XTi, Friday, 11 January 2008


Overall rating (weighted)
5.0
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
5.0
I bought this lens instead of the kit lens for the Canon XTi camera. The lens is great to cover normal day to day photography needs. With ISO 800 and 1600 and this fast image stabilize lens I can do available light photography even at night or faintly lit rooms. The weight distribution with the camera is very nice.

Update:
I have been using this lens for 3 months now and it is my workhorse lens (my other lens is a Canon 50mm f1.8). This lens is an excellent piece of glass. The pictures are sharp throughout the range and with a f2.8 aperture in combination with image stabilization you can shoot in extremely low light. Great lens for street photography as it has a super fast auto focus. I also use it as my main lens for portraits, I use the 50mm f1.8 when I want a extra short Depth of field.
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1 of 1 people found the following review helpful

Upgrading your lens for Rebel XTi? 17-85 USM IS vs, Monday, 07 January 2008


Overall rating (weighted)
5.0
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
5.0
Folks, I know you want it short. But I am covering quite a Bit of information and condensed it so that you can get good information and are able to digest it in less than 5 min.

It is quite surprising how many people are being "tortured" with the question on which lens is the right lens when it comes to finding the perfect lens to upgrade the Canon XTi Rebel kit lens (18-55) or even for the Canon 40D (which is often sold with the 28-135 USM IS lens).
I read about 500+ reviews and many of them I found very interesting but really did not answer my question on what a good lens is for the Rebel XTi... and with good reasons because YOU have to know what you want or need and then make a call. Here were the criteria I used and I hope you can leverage from these:

1. I wanted a lens which has a great picture quality to have a true upgrade feeling from the Canon 18-55 kit lens (during day light that lens is actually very good and with its light weight is a great carry around lens - however in low light or for really nice portrait shots this lens has limitations not to mention its built quality)

2. I wanted a versatile "Walk Around" lens with good zoom range to cover most of the picture I take (landscape and portraits) in addition to my telephoto lens (70-300mm)

3. If possible a low weight lens - however image quality was a higher priority for me

4. I wanted a Canon lens (though there are very good alternatives from Tamron and Sigma - however they have some disadvantages but given the lower price worth considering)

5. I wanted an Image Stabilizer (IS) and a low noise focus motor, i.e. Canon's USM

Many people are looking for a great "Walk Around" lens to avoid changing lenses all the time yet at the same time want great picture qualities. So, your criteria may be different and therefore your choice certainly a good one may differ from mine.
As one disclaimer upfront - I am not going into the professional details, i.e. Vignetting differeneces at different aperture values or zoom ranges - to make it simple for many readers in this field who just want to make a good decision to buy a great lens without going through the trouble of returning lenses.

You will find many reviews on the cropped camera lenses (EF-S) and still people often don't get it right. So, if you have a cropped camera like the Canon Rebel XTi or Canon 40D then the cropped factor is 1.6. In other words no matter what lens you put on these cameras you will get the following zoom ranges which are different from the product names for the lenses:
Canon Lens Min Zoom Max Zoom
17-85: 27.2 - 136
28-135: 44.8 - 216
17-55 f2.8: 27.2 - 88
24-105 f4.0 L: 38.4 - 168
Source: Canon's website


I went through the extra burden of testing all the lenses myself and not just rely on reviews. So, I went ahead and rented them for 1-2 days and then made up my own verdict so to speak. I also took pictures in similar conditions, looked at them on the computer and printed them out to compare the lenses:

1) The first upgrade lens from Canon which comes to mind is the EF-S 17-85 USM IS f3.5-5.6 lens. This lens would have been a great kit lens but did not meet my requirements for an upgrade lens. It has a very good zoom range and it is still light weight. But the image quality is not as sharp as I would like it to be. And if you commit to spend more money (like $500 for this lens) then you don't want to waste it by just getting a bit more zoom range and an Image Stabilizer.


2) The first lens I actually tried was the EF 24-105 f4.0 USM IS L (luxurious) lens from Canon and I was really happy about the image quality. I was very close to buy this lens but wanted to check out other lenses first. Following drawbacks for me: it is not a wide-angle lens which is useful for landscape shots or even travels shots when you can't afford walking back 5-10 feet. Plus a wide angel lens can give you a nice effect on the picture itself. Another drawback is the aperture value of f4.0 in low light. An aperture factor of f2.8 is faster in low light (the lower the value the larger the aperture - think the Iris of your eye is getting larger and therefore you can see better in low light) and with a running kid or pet at home that is a true advantage. However, with the Image Stabilizer this would not be a big issue. (For more advanced people you can stop down one step to get enough light into the lens in low light conditions but if the object is in motion that may be tricky.)
A big plus however is the option to use this lens for any non-cropped canon camera. However, I am ok with using the Rebel XTi and if I want to upgrade to another body later then the 40D would be a great way to go. So, I don't mind to buy EF-S lenses. The EF-S lenses have the advantage that they are generally lighter weight than the full frame lenses.


3) The EF 28-135 USM IS f3.5-5.6 lens has a great zoom range (44-216) but does not have a wide angle (basically anything less than 35mm). However