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Your kit is a f/3.5 but it's not a constant f/3.5 right? It's probably like a f/3.5-5.6. the Tamron would be a constant f/2.8 throughout the zoom range and it does make a big difference. I have read good things about that Tamron and I'm thinking about getting one myself since they just released their own AF-S equivilent for Nikon.
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