Camera Lens Canon 18 55mm F 3.5 5.6 Ef S- Information

By Author: Syaiful
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EF-S 18-55/3.5-5.6 unusual lens Canon EOS . It was designed only to drive Digital Rebel (EOS 300D body), because it is on the small image (sufficient for the sensor Rebel Digital, but not enough for full frame 35 mm) and S 'body paste more cells of normal target range of EF. [Editor's Note: This version of the order is also part of Canon Rebel XT, when sold as a bag with the lens. This lens is Canon EF-S 18-55 f/3.5-5.6 II. It was reported that the new model has the same optics that the old model and the differences are merely cosmetic.]
"S" in EF-S is "in the center of attention again." Return attention to the distance between two points in the last film surface of the lens or optical sensor. There are several advantages in the design of the lens in which the gap for small and wide angle objectives, but the limit on SLR cameras is determined by the requirement that the mirror must not hit the target, if a refutation. Mirror Digital Rebel less than full frame 35-mm cameras, because the sensor is small, and only the mirror should be enough to cover the sensor floor. This allows the lens to focus at a short distance behind. ...
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Performance
EF-S targets were met with what was more likely than the expectations of some people. He argued that, if you do not cover the total cost of 35 mm and a framework like this can be done in order to act in a film that is closer standard lens, the performance will be much better than expected with lens $ 100. So, maybe, but who do not understand that reducing the distance between this goal only after several 18 mm and 22 mm. Up to 22mm, the rear of the length of the lens fokusuese shorter than can be used for the regular order of EF, and the range of the image (or coverage area) is actually large enough to cover the entire frame is 35 mm (of course, and although not in high quality, according to the curve SMN below). The difference in the minimum distance between the objective approach after EF and EF-S is a bit more. Maybe 1 or 2 mm. Thus, while the lower coverage and lower backfocus images may help a little wider at the end, it really is not reasonable to expect that to work as a complete lens $ 100 $ 1000 "L" Lens "series, If you really want all very technical stuff, here the curves MTF (from Canon, but not me!). Solid / dashed, blue / gray and thick / thin lines with multiple machines and spatial frequencies. They explained on the website of Canon USA. If we compare with other cards Canon SMN, do not forget to mention that on the horizontal axis only goes 0-13 mm and 0-22 mm lens, so that only specified for use with 22 / 7 X 15.1mm image sensor with a ring of about 27 mm ( 35 mm to 43 mm full frame)

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