I have read a lot of tests and was skeptical considering repeatedly reported problems with exposure and autofocus on some Nikon bodysuits. After the first test photos 2-3 then the shock. The D90 reports errors "F--" and no longer focused. Camera on / off resolves the issue. A quick research shows that brand-new "Tamron" lenses, the CPU contacts are provided under certain circumstances with a too thick protective layer. The camera does not recognize then the lens. After repeated and dismantle this error then no longer showed. Optical zoom does play in the league of optics, require double the price for the camera manufacturer. Especially at the long end. The VC freezes the viewfinder image and is generally very effective. However, negative is the high power consumption. So I really only when it is necessary to activate VC. Conclusion: High-quality optics at an affordable price, complemented by a 5 year warranty Tamron. Here you can do little wrong.
