Initially looked at the Sigma 150-600 sport, got talking to one of the managers who suggested we look at the newer version of the Tamron - in shop testing the Tamron was really quick to lock on and looked to be slightly sharper BUT that could also have been because it is so much lighter than the Sigma there is less 'weight shake' and the final decission maker almost £400 cheaper at a pound under a grand.
Will add a couple of Cory's test shots later but for now - in use at Minsmere on the way home.
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