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Message: <blockquote data-quote="Rob Bye" data-source="post: 414939" data-attributes="member: 23425">It's true. I chose the Sigma 150-600 Sport over keeping my Tamron. For what I do, I needed the extra weather sealing the Sigma provides. My lenses are always frozen/wet/scorched. 40 degrees C or -40 degrees C, I need my lenses to work, and the Sigma offered a better chance of meeting that requirement.As far as comparisons between the Tamron and Sigma, I was never able to do a proper head to head test, before the Tamron went to its next owner. My impression is that both brands offer similar sharpness, but the Tamron demonstrated a bit of aberration on certain subjects. At the time, I said it lacked that "Nth degree" of clarity. That isn't an issue with the Sigma - it's a Rock Star at 600mm and at maximum aperture - even at -40C.</blockquote>