
There are many differences between those two and their price is one of them. Still if you thought these were two similar constructions just put into different casings you would be wrong. The reaction of Sigma was untypical, launching two models with identical 150-600 mm f/5-6.3 parameters. In fact, less than a year after the launch of the Tamron, during the Photokina 2014 fair, there was not one but two answers presented. You didn’t have to wait for the answer of Sigma too long. From the very start it has enjoyed very positive reviews and it’s been selling so well that the factory had temporary problems with meeting the market demands. In November 2013 Tamron launched the Tamron SP 150–600 mm f/5–6.3 Di VC USD lens.

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