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  1. rosbifs

    Tamron 2nd generation SP 150-600mm Di VC USD 'G2'

    I had big problems with my Sigma and 750d until I read the following http://www.the-digital-picture.com/News/News-Post.aspx?News=15624 Really has made the difference although I can't say why....There is a bit more background on the sigma thread.