Đánh giá tamron 17-50 vc

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Tamron AF 17-50mm f/2.8 SP. XR Di II LD Aspherical VC (Canon) - đánh giá / Test Report
Lens Đánh Giá - Canon EOS (APS-C)

Đánh Giá by Klaus Schroiff, published January 2010Special thanks to lớn Marcel Sahlmen for providing this lens!IntroductionThings have sầu been busy in the standard zoom lens market lately - both Canon và Nikon have sầu upgraded most of their lineup lớn image stabilized variants and the third-các buổi tiệc nhỏ gang follows albeit slowly. Sigma introduced their OS ("Optical Stabilizer") in a number of lenses và it seems as if Tamron is now next in line with their VC ("Vibration Compensation"). Tamron started the overhaul of their lineup with their extreme zoom lenses - the Tamron AF 18-270milimet f/3.5-6.3 VC and AF 28-300mm f/3.5-6.3 VC. Regarding their sales volume these are their key lenses so they seem lớn be pretty much convinced that their VC system is ready for prime time. The Tamron AF 17-50mm f/2.8 SP XR Di II LD Aspherical VC reviewed here is even more ambitious because large aperture IS/VC lenses are even less forgiving with respect khổng lồ quality control issues (VC/IS is technically nothing else but a controlled decentering). The pricing is very competitive at around 550EUR/650US$ which is about a third less than the Canon EF-S 17-55mm f/2.8 USM IS - the undisputed king in this lens class (at least in Canon EF mount).
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The build unique is typical for a consumer grade zoom lens although Tamron SP.. ("Super Performance") lenses are actually intended lớn target the high kết thúc market. Most of the lens is made of good unique plastics based on a metal mount. The zoom ring operates quite smoothly. The focus ring has only a very short focus path so accurate manual focusing is a bit on the difficult side. It is somewhat anachronistic that the focus ring still rotates in AF mode - neither Canon USM nor Sigma HSM lenses show this effect anymore. The lens extends when zooming towards the long kết thúc of the zoom range & the supplied petal-shaped hood adds a little extra length. Thanks lớn internal focusing, the front element does not rotate so using a polarizer remains easily possible. The lens is quite a bit bigger compared to its non-VC sister lens although still smaller than the Canon EF-S 17-55mm f/2.8 USM IS.
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The Tamron AF 17-50mm f/2.8 VC still relies on a conventional AF micro-motor. Speed-wise this is not a problem because of the already mentioned short focus path (turning the focus ring by a ~40 degrees traverses the whole focus range) but AF operations are noticeable (noise-wise). The AF accuracy was a bit soso on our kiểm tra DSLR. The AF performance in Live-View mode (contrast AF) is rather mediocre. Regarding the VC Tamron claims an efficiency of up khổng lồ 4 f-stops. While we can confirm that the VC works very well we recommover lớn avoid exploiting this khổng lồ the max due khổng lồ the increasing number of outliers in field conditions.