cant seem to decide between the Sigma 18-50 2.8 and the Tamron 28-75 2.8. I'd love to get the 18-50 to get rid of my 18-55 EFS. The main purpose of this lens I wanna get, either the Tamron or Sigma is to shoot concerts. Very often, Im it the foot of the stage, just a few inches from performers, where 18mm would really help, especially at 2.8. However, I think I may be able to live with 28mm. I see amazing reviews on the Tamron, yet mixed reviews on the Sigma. Does anyone here have experience with one or both? Which would you reccommend in my situation? The main selling points are sharpness, usability at 2.8, and abilty to AF, somewhat quickly, but more important accuratly in low light.
Thanks.
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