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The Canon EF-S 17-55mm f/2.8 IS USM Lens, with a fast, fixed f/2.8 aperture, very high image quality, 3-stop Image Stabilization and a very popular focal length range, is one of the best general purpose lenses available.

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Since EF-S lenses only mount on Canon EF-S bodies - which all feature a 1.6x FOVCF -the 17-55mm focal length range always equates to the field of view of a 27.2-88mm lens mounted on a full-frame Digital SLR.This range covers what I consider to be the most important focal lengths for a Canon general purpose lens.This is a focal length range that can be used for everything from a wide scenic landscape khổng lồ a relatively-cđại bại portrait.

Canon already had these focal lengths similarly covered in their econo kit lens - theCanon EF-S 18-55mm f/3.5-5.6 Lens.Reality is that these are vastly different lenses - in build, optical và feature qualities - và price.The kit lens is a good value for the money, but does not compare with the 17-55 IS.

Canon already had a superset of the 17-55milimet focal length range covered with theCanon EF-S 17-85mm f/4-5.6 IS USM Lens.The EF-S 17-85 IS has a higher build chất lượng, image unique và feature set than the EF-S 18-55 - adding Ring USM và 3 stop image stabilization lớn the feature set.What the 17-55 IS adds to lớn the 17-85"s feature set is a fixed f/2.8 aperture & L-Series grade UD (Ultra-Low Dispersion glass) lens elements.Of course, price, form size, weight và a reduced focal length range are the downsides of the 17-55 compared to the 17-85.


Positioned above sầu from left lớn right in their fully retracted positions are the following lenses:Canon EF-S 18-55milimet f/3.5-5.6 IS II LensCanon EF-S 15-85mm f/3.5-5.6 IS USM LensCanon EF-S 10-22mm f/3.5-4.5 USM LensCanon EF-S 18-135milimet f/3.5-5.6 IS LensCanon EF-S 18-200mm f/3.5-5.6 IS LensCanon EF-S 55-250mm f/4-5.6 IS LensCanon EF-S 17-55milimet f/2.8 IS USM Lens

The same lenses are shown below in their fully extended states with their lens hoods in place.


With a fixed fast f/2.8 aperture (meaning the widest aperture opening is f/2.8 through the entire focal length range - f/22 is the narrowest setting),exposure settings bởi not change when zooming in on a subject.To some, this is not a big giảm giá - to me, this is a great feature.F/2.8 is as fast as any Canon zoom lens currently made.It is fast enough to stop action in many indoor venues (higher ISO settings typically required - fast action indoor sports may require f/2 or wider).This wide aperture also activates the higher autofocus sensitivity mode for certain focus points in many Canon bodies (f/2.8 does not have sầu khổng lồ be selected khổng lồ get the benefit of this feature).F/2.8 also presents a bright viewfinder to the user.

Wide open, the 17-55 is able lớn produce a nicely blurred background.By employing a circular 7-blade aperture barrel, the Canon 17-55mm Lens produces a decent chất lượng background blur even when stopped down.With a focal length range that is composed of relatively wide focal lengths, this lens needs a cthua trận subject khổng lồ create a diffusely blurred background.

Combining an f/2.8 aperture with the 3 stop image stabilization, the Canon EF-S 17-55mm f/2.8 IS USM Lens is arguably the most handholdable lens Canon currently makes.Image stabilization will allow a shot to be taken at a shutter tốc độ up to lớn 3 stops slower than without IS.Sorry, but IS will not stop subject motion.This IS version is tripod sensing to prsự kiện feedbachồng loops between the IS sensor & stabilizer motor vibrations.The manual recommends turning IS off when tripod-mounting the lens (to save sầu battery life) or when panning (panning mode IS is not available).Leave IS on when handholding or shooting from a monopod.The IS implementation on this lens is very well behaved - it is quiet and does not cause the image to jump when starting up.


The three lenses compared above are from left lớn right, theCanon EF-S 17-55milimet f/2.8 IS USM Lens,Canon EF-S 17-85milimet f/4-5.6 IS USM Lens andCanon EF-S 18-55milimet f/3.5-5.6 IS Lens.All lenses are shown extended to lớn their maximum lengths with their optional lens hoods attached.


With Ring USM (Ultrasonic Motor), the 17-55 IS focuses very quietlyvery fast.Focus accuracy has been very good for me (an even more important fact).Note that, while I did not notice an issue, some are reporting AF accuracy inconsistencies at infinity focus distance.

FTM (Full Time Manual) focusing is a very nice feature of this lens.The focus ring is rather small, but turns easily.Likely to get far more use is the zoom ring - it is very nicely sized and turns smoothly with little effort.The AF & IS switches are recessed lớn prevent accidental changes.

Canon claims that "By optimising Super Spectra lens coatings và lens element shaping, Canon’s engineers have sầu been effective sầu in suppressing flare và ghosting ­ more prone to lớn occur with digital cameras due khổng lồ reflection off the image sensor. By increasing light absorption, coatings reduce reflections off lens element surfaces lớn deliver crisp, undistorted images with natural colour balance."In reality, I am finding the 17-55 IS lớn be quite flare-prone if the sun or bright light is in the frame.Otherwise, color và contrast are excellent.


Prior to receiving my 17-55 IS, I stated that I expected its image quality lớn match or nearly match that of Canon"s L Series Lensesas it shares the L-Series UD lens elements.As it turns out, my 17-55 matches or exceeds the optical performance of my L-Series zooms in this similar focal length range ...

This lens is sharp! Wide open & from edge to edge.Unless the distance is cthua that is - I"m finding that cthua kém subjects vày not produce the same image sharpness as normal distance subjects.The ISO 12233 chart kiểm tra results indicate this as well.The 17-55 IS shows slight sharpness improvement at f/4, but performance at f/2.8 is very good.

My Canon EF 16-35mm f/2.8L USM Lensis slightly sharper in the center at 17milimet wide open, but the 17-55 IS is sharper at all other tested focal lengths - and proved much sharper in the corners at all focal lengths và apertures.Distortion was also less on the 17-55.In my opinion, the only reasons lớn buy the 16-35 over the 17-55 are for full-frame compatibility (a big reason), better build chất lượng & environmental sealing (EF-S compatible bodies are not weather sealed at this time).

Similar story with the Canon EF 17-40milimet f/4L USM Lens.The 17-55 IS is sharper at all other tested focal lengths - and proved much sharper in the corners at all focal lengths & apertures.At cthất bại distances, the 17-40 had sharper corners and held its sharpness khổng lồ a narrower focal length than the 17-55.Lower barrel distortion at the wide kết thúc is also in the 17-55"s favor.Full-frame compatibility, better build quality và environmental sealing are in the 17-40 L"s favor.I suspect the wider price discrepancy between these two lenses will keep sales of the 17-40 L going stronger than for the 16-35.

The Canon EF-S 17-85milimet f/4-5.6 IS USM Lensboasts a longer focal length range but lacks the fast aperture và is not as sharp (especially in the corners) as the 17-55 IS.The two lenses are rather cthua in center sharpness but most of the time my primary subject is not dead center in the frame.Once again, lower barrel distortion at the wide over is in the 17-55"s favor.Price is also a differentiator between these lenses.

The similarly-built Canon EF-S 10-22mm f/3.5-4.5 USM Lensturned in similar optical results lớn the 17-55 IS in the short range of focal lengths that overlap.I see these lenses more as complementary than competing.

At all overlapping focal lengths and apertures, the 17-55 is sharper than myCanon EF 24-70milimet f/2.8L USM Lens.

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The mặc định image below is a 100% crop from the 17-55 IS at 55mm, f/2.8.Mousing over the image will show a crop from the Canon EF-S 18-55milimet f/3.5-5.6 IS Lens at f/5.6 (wide open).Keep in mind that the 18-55 IS should have sầu a DOF advantage, but you will see the 17-55 IS still performing better in the foreground & background.Also, the vehicle grill is the center of the frame - where the 18-55 IS competes best.However, this focal length is the weakest in the 18-55 IS"s range.


Some additional information about the above comparison ...This comparison was shot with a Canon EOS 40D.There was a 250-pixel-wide swath removed from the image as indicated by the White line.This allows a foreground object and some background lớn be present in the image lớn confirm focus accuracy.

Images were shot as RAW and processed with the Neutral Picture Style (0 Contrast) và sharpening = 1 (very low - 2 would look noticeably sharper).Images were converted in DPPhường khổng lồ 16-bit TIFF files, cropped in Photocửa hàng and saved as 80 quality JPG files.The lighting was harsh mid-day sunlight on a clear day.A tripod was used - the shutter speed was 1/2000 for the f/2.8 shot 1/500 for the f/5.6 shot.

In addition to being sharp, CA (Chromatic Aberrations) are very well controlled in the 17-55 IS.The following example is meant khổng lồ show the difference in CA between an economy lens (18-55 IS again) and a top chất lượng zoom.This one was shot at 17mm/18mm and at f/5.6 for both lenses.This 100% crop sample is located about 25% into the frame from the top left corner.Mousing over the image will show the 17-55milimet IS advantage.


Distortion is present over most of the 17-55milimet focal length range.Mild barrel distortion is present until about 24milimet where pincushion distortion becomes present through 55milimet.Your spouse will appreciate how the 17-55 makes them look thinner at the longer focal lengths (use this excuse if you need help getting spousal purchase permission).

Being a wide aperture, wide angle lens, expect lớn see some vignetting from the 17-55 IS.The amount of vignetting is less than I anticipated - basically visible only in the corners at f/2.8 when photographing an even-colored subject such as a blue sky.One of the benefits of using an EF lens on a 1.6x toàn thân is that much of the lens vignetting is not apparent within the cropped field of view.

Click on the image below khổng lồ compare the Canon EF-S 17-55mm f/2.8 IS USM Lens lớn other lens models with và without hoods (opens in new window khổng lồ save sầu your place in this review).


The 17-55 passes distance information lớn the camera body for use in E-TTL II exposure determination.Most new Canon lenses have included this feature.

The Canon EF-S 17-55mm f/2.8 IS USM Lens is a middle weight at 22.8 oz (645g).At 3.3" x 4.4" (83.5milimet x 110.6mm), the 17-55mm IS becomes the largest EF-S lens to date.It is, however, a very nice size/weight to carry around & balances well on compatible camera bodies.


To put kích thước into perspective, the above size comparison phokhổng lồ includes from left to lớn right theCanon EF 17-40milimet f/4L USM Lens,Canon EF 24-105mm f/4L IS USM Lens,Canon EF-S 17-55milimet f/2.8 IS USM Lens andCanon EF 24-70mm f/2.8L USM Lens.The same lenses are show fully extended below.


Similar to lớn many of the L-Series zooms, the 17-55 IS features a 77mm filter thread.A feature appreciated by circular polarizer filter users is the non-rotating front element (does not rotate with focusing or focal length change).The 17-55 extends with focal length increase, but does not extend with focusing.

With a relatively-long-for-its-focal-length-range closest focusing distance of 1.15" (0.35m),the 17-55 IS yields a meager maximum magnification of 0.17x (at 55mm).As usual, extension tubes can increase the magnification ability significantly.With the Canon EF 12milimet Extension Tube II, magnification is 0.45x-0.231x.With the Canon EF 25milimet Extension Tube II, magnification is 1.71x-0.51x (Canon"s spec).As this is an EF-S lens, version II of Canon"s Extension Tubes are required.The 17-55 is not compatible with Canon"s Extenders.

The 17-55 IS shares thiết kế and build qualities with Canon"s other recently-released EF-S Lenses -especially the Canon EF-S 10-22mm f/3.5-4.5 USM Lens.It is nicely designed và well thought out, though I don"t prefer the rear-positioning of the manual focus ring (that is where I generally grip the lens).The 17-55 IS is not as elegant in design và function as the L-Series zooms, but it is very good in this regard.Not real important but missing is the Canon date code.

I"m not sure why Canon did not go all the way và make the 17-55 IS an L-Series lens.An upgraded (metal) lens barrel seems khổng lồ be the missing component - và the red ring.Also, the accessories included with L-Series lenses are missing - the Lens Pouch LP1219 và 17-55 IS-exclusive Lens Hood EW-83J are optional.Since Canon has an L-Series lens on the PowerShot Pro 1, making a non-"EF" L lens is apparently not outside of their definition.This lens certainly has the image unique to lớn be an "L".


With the help of a 12milimet Extension Tube, you can physically mount this lens on a full frame toàn thân.But you probably will not want lớn.The image above sầu shows the image circle as seen through this combination by a Canon EOS-1Ds Mark III.In addition khổng lồ the heavy vignetting, AF does not work & the aperture information does not report to the camera.Even in MF mode, more hurdles remain - at 55milimet, the 17-55 will not focus any farther away than about 7" or so in front of the lens.This distance rapidly decreases as the focal length is widened until the subject is against the glass và beyond this point no subject can be in-focus.It was a fun exercise at least - and now we know.


I am getting some tin nhắn asking about dust issues with this lens.Some are seeing a noticeable amount of dust collect under the front element.Dust seldom makes a noticeable difference in image quality - No one has indicated lớn me that their dust has affected the image quality of their 17-55.But it is not normal for this amount of dust to lớn accumulate inside the lens.My 17-55 came with one small spechồng of dust in it (a genuine Canon factory dust speông chồng I suppose) và has not accumulated any additional dust.I"ve sầu shot thousands of mostly outdoor pictures with this lens.

Weddings, events, parties, family activities, portraits, landscapes, stage shows, car shows, night sky ... there are far more uses for this lens than I am going to lớn think of.Unless there is an tăng cấp khổng lồ a 1.3x or full frame toàn thân in your future, the Canon EF-S 17-55milimet f/2.8 IS USM Lens is an ikhuyến mãi lens to include in your kit.Even if a larger format sensor toàn thân is in your future, the resale value of this lens remains svào.

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With the introduction of the 17-55 IS, Canon displays its commitment khổng lồ the EF-S line of lenses.With the huge base of Canon EF-S Digital SLR users, the 17-55 IS, with its excellent features, specs & image chất lượng, will find a home in many professional & amateur photographers" kits.This is the lens I keep mounted on my 1.6x body (currently a 50D) - I highly recommend it.

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