I have a Rebel XSi. I have two lenses the 18-55 that came with the camera and the 55-250. My daughter is a dancer and she dances in dance competitions. I have been using my zoom and adjusting my shutter speed or aperature to take my shots. My pictures have been pretty good but I would like to improve them if possible. I went to my local camera store today and they recommended the Tamron 18-270 because of the 72 diameter which would allow some additional light to help with my shots. I just wanted to see if anyone out there had other recommendations. I also wanted to know if I will be able to tell a difference between my current zoom lens and the Tamron because I don't really want to pay for this lens if I'm not going to see any improvements. Thanks.
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