The Canon EF-S 17-85mm f/4-5.6 IS USM Lens combines a very useful zoom range with image stabilization in a light & well-performing package.
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Keep in mind that the 17-85 IS is an "EF-S" lens and only works on EF-S compatible Canon EOS bodies such as the **D & Digital Rebel / ***D Series.EF-S is Canon"s moniker for Small Image Circle.The distance between the film (sensor) plane và the rear of the lens is shorter than in an EF lens.Many question the longevity of this standard.My expectation is that it will be around for a long time - easily long enough for most people to lớn get their desired value from a lens.
There also seems to be confusion about how the 1.6x Field of View Crop Factor (FOVCF)relates khổng lồ EF-S lens framing.The answer is that you still need to apply the "focal length multiplier" to get the conventional 35mm equivalent field of view.The focal length is based on physical kiến thiết of the optics.Yes, even though the lens is designed for 1.6x FOVCF digital bodies,the framing is still equivalent lớn a longer focal length lens on a full frame body.
Why put Image Stabilization inlớn a wide angle khổng lồ short telephokhổng lồ zoom lens?For the same reason you put it into lớn telephoto lớn lenses - to lớn reduce camera shake. Since the 17-85 IS has third generation IS, it can be handheld up to 3 f-stops lower than a non-IS lens at the same focal length.Granted, a wide angle lens can be handheld at lower shutter speeds than a long telephokhổng lồ lens, but being able khổng lồ hold them at even lower shutter speeds is a great benefit lớn me. It also compensates some for the slow/narrow wide open aperture.This lens can be handheld at slow enough shutter speeds khổng lồ allow significant subject motion blur when desired - such as moving water.The moving water pictures in the 17-85 IS sample gallery were all shot handheld - down khổng lồ 1/3 second.
IS on this lens also allows for a very large DOF (Depth of Field) while shooting handheld.Landscape photography is one style of photography that benefits from this feature.
Pictured above sầu from left to lớn right are theCanon EF-S 18-55mm f/3.5-5.6 Lens, Canon EF-S 60milimet f/2.8 USM Lens,Canon EF-S 10-22mm f/3.5-4.5 USM Lens,Canon EF-S 17-85milimet f/4-5.6 IS USM Lens andCanon EF-S 17-55mm f/2.8 IS USM Lens.The same lenses are pictured fully extended below.
Do not plan to lớn use the Canon EF-S 17-85milimet f/4-5.6 IS USM Lens to stop action unless you have sầu plenty of light -or plan khổng lồ use a flash for the main lighting (usig the bright flash to lớn stop the action).Also, getting a diffuse background blur is not easy with a less that only opens lớn f/5.6 at 85milimet.It takes a cthất bại subject and plenty of open space behind the subject khổng lồ get a good background blur.
The background blur quality you vị get with the 17-85 IS is fine.Curved aperture blades are partly responsible for this feature.Out of focus highlights retain round shapes even when the 17-85 is stopped down.
With ring USM, the Canon EF-S 17-85mm f/4-5.6 IS USM Lens focuses very fast - & very quietly.FTM (Full Time Manual) focusing is enabled in AF mode.IS on this lens is also quiet while engaged.There is a noticeable cliông xã when IS is started and stopped, but only a quiet hum is audible while IS is functioning.
The 17-85 IS utilizes an extending but non-rotating front element.The non-rotating kiến thiết feature is appreciated by Circular Polarizer Filter & split ND (Neutral Density) Filter users.
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Although not a macro lens, the 17-85 IS focuses down lớn 1.15" (.35m) for a MM (Maximum Magnification) of .2x.Cthất bại enough khổng lồ fill the lens with smaller subjects such as flowers.
The three lenses compared above sầu are from left to 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 18-55mm f/3.5-5.6 IS Lens.All lenses are shown extended lớn their maximum lengths with their optional lens hoods attached.I recommover getting the Canon EW-73B lens hood for this lens.The Lowepro Lens Case 1W is a good choice for storage/transport.
Since the Canon EF-S camera bodies feature a 1.6x field of view crop factor,the 17-85 IS has the equivalent field of view/framing lớn a 27.2-136mm lens on a full-frame camera toàn thân - nearly equivalent to lớn theCanon EF 28-135milimet f/3.5-5.6 IS USM Lens.My observations are that this lens also performs optically similar to lớn the 28-135.The two lenses are very similar in form size - the 17-85 measures 3.6" x 3.1" (92milimet x 78.5mm) (lxd) và weighs 16.1 oz (475 g).Build chất lượng is similar as well.The two primary differences between these lenses are the focal length range & the newer image stabilization system in the 17-85.
The 17-85 IS has decent build chất lượng.Not L class, but it has a nice chất lượng feel.
Optical performance is also not L-class, but reasonable.Center sharpness is very good at all focal lengths & improves very little when stopped down.Some corner softness is present at most focal lengths and apertures.
Light fall-off is noticeable until stopped down or zoomed out to 35milimet or so.Barrel distortion is very noticeable at 17milimet & is also mostly gone by 35mm or so.CA (Chromatic Aberation) is very svào at 17milimet, well controlled through the mid focal lengths and again visible at 85milimet.
Flare is only moderately controlled.Vignetting is apparent on the wide over of the focal length range until stopped down.
Use the mouseover links above lớn compare the 17-85 IS with theCanon EF-S 18-55milimet f/3.5-5.6 IS Lens,Canon EF-S 18-200milimet f/3.5-5.6 IS Lens andCanon EF-S 28-135milimet f/3.5-5.6 IS USM Lensmounted on a Canon EOS 50D.
The 17-85 IS is a significantly better lens than the significantly less expensiveCanon EF-S 18-55mm f/3.5-5.6 Lens,và better than theCanon EF-S 18-55milimet f/3.5-5.6 IS Lens,but it is not optically the equivalent of theCanon EF-S 17-55milimet f/2.8 IS USM Lens or some of the L-Series lenses in similar focal length ranges.The Canon L Series Lenses will provide better sharpness (especially in the corners) & contrast at equivalent apertures in addition to lớn having better build unique.Light fall-off is not present in these lenses at 1.6x field of view, CA is better controlled ...While not an L lens, the 17-55 is at least as good optically.
But, the 17-85 IS is going lớn be the right lens for a lot of people.With its wide 5x zoom range, the 17-85 makes a great walk-around lens.There is a huge range of subject matter that fits nicely in this focal length range.And in addition lớn being relatively small & light, the 17-85"s image unique is quite good.
The Canon EF-S 17-85mm f/4-5.6 IS USM Lens is a lens I recommend for many situations.
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