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Tamron AF 17-50mm f/2.8 SP XR Di II LD Aspherical (Nikon) - reviews / kiểm tra Report
Lens đánh giá - Nikon / Nikkor (APS-C)

Review by Klaus Schroiff, published July 2006Special thanks lớn Peter Poete for providing this lens!IntroductionThe Tamron AF 17-50mm f/2.8 SP XR Di II LD Aspherical is the latest addition lớn the popularset of fast standard zooms. Tamron has categorized the 17-50mm as SP (Super Performance)lens - Tamron"s professional grade hàng hóa league.As indicated by the Di II the lens provides a reduced image circle so it is onlycompatible lớn APS-C DSLR (tested on the D200). Its field-of-view is equivalent to~25.5-75mm (1.5x crop) on full frame cameras. The lens is available in Canon, Nikon and Sony(KM) mount. At a price around 400€/US$ the Tamron costs only a fraction of the genuinemanufacturer alternatives making it pretty attractive to budget shoppers who are looking fora good deal for their bucks.
(the image shows the Canon EOS variant of the lens)The build unique is very decent but typical for most Tamron lenses there"s a little too much plastic in there for my taste.Nonetheless it is still one of the better implementations in Tamron land. The zoom ring feelsvery smooth. Same goes for the focus ring which is even a little damped.As you can see in the sản phẩm shot above the lens extends when zooming towards the longend of the zoom range and the supplied petal-shaped hood adds a little extra length on top.Thanks to internal focusing the front element does not rotate so using a polarizer remainseasily possible.The lens has no internal AF motor and relies on a slotted drive screwoperated by the camera. However, due to lớn a very short focus path (about 45 degrees) thethe AF is very fast. AF accuracy wasn"t overly impressive on the D200.

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