Canon ef 28

     
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Review by Klaus Schroiff, published October 2005Special thanks lớn Markus Stamm for providing this lens!IntroductionReleased in early 1998 the Canon EF 28-135mm f/3.5-5.6 USM IS was the first standard SLR zoomlens featuring an image stabilization (IS) mechanism.Using its IS capabilities the camera motion is detected by 2 gyro sensors which measure theangle và speed of the shake. This information is used khổng lồ shift a lens group off the opticalaxis (basically a forced decentering) to counteract this motion. The result is a significantimprovement of handholdibility under extreme conditions. According to Canon the stabilizingeffect is equivalent lớn about two steps of shutter tốc độ - reads: slower shutter speed sothere may be side effects with moving objects in your static scene. Besides the IS on this lenscannot be used for object tracking purposes. Nonetheless IS is immensely useful in the fieldif you don"t want or cannot carry a tripod.The combination of 5x zoom ratio, a range from wide-angle to lớn short tele and ISmade it an attractive allround zoom - consequently with a huge success in the film SLR market.Well, that was then but today APS-C DSLRs rule the mainstream & will continue to vị so for afew years. Due to the 1.6x cropping factor the zoom has a field of view equivalent khổng lồ ~45-216mmon full frame cameras. So on APS-C DSLRs it can be classified as short tele zoom rather than anallround zoom. Consequently Canon released the EF-S 17-85mm f/4-5.6 USM IS lớn fill the gap witha similar field-of-view lượt thích the 28-135mm on full-frame SLRs.Nonetheless the lens is surely still present in many camera bags so it makes sense to lớn checkit out in the APS-C scope (as usual on the EOS 350D/Digital RebelXT). Its range could stillmake sense in conjunction with an ultra-wide zoom lens lượt thích e.g. EF-S 10-22mm + EF 28-135mm IS.
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The lens extends during zooming being shortest at 28mm and reaching its max. Length at 135mm. As youmay notice below the lens features a so-called duo-cam zoom system with two inner lens tubes.The optical kiến thiết includes 16 elements in 12 groups with one molded glass aspherical lens element inthe rear group. Its aperture mechanism features 6 aperture blades. With a form size of 78x97mm và 549git isn"t one of the smaller standard zooms out there but a 5x zoom range & image stabilizationsimply doesn"t come for miễn phí here.The build quality is decent though not great. There"s a little play in the duo-cam systemand the focus & zoom control rings aren"t damped. Nonetheless it"s one step up from bottomend products. The lens has a very fast và near silent USM (ultrasonic) AF drive with allows full-timemanual focusing in one-shot AF mode. The minimal focus distance is 0.5m resulting with a max. Magnificationof 1:5 at 135mm. The front element does not rotate so using a polarizer is no problem.