Anke, I have the Tamron 28-300 lens and I love it. The lens that you are speaking of was introduced about 6 months after I got mine. Since I won mine at the CPR Conference, the money was not an issue. I think that if I was buying one now I might choose the 18-270 because I love to shoot close up.
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My Gallery
My Gear: Canon 50D, Canon EF 50mm 1.4, Canon EF 28-135mm 3.5-5.6 IS, Tamron 28-300mm IF
My Software: PSE 7, Noiseware Professional, Lightroom 1.4
 
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