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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 148633" data-attributes="member: 10742">Both Tamron and Sigma produce quality products... Your question and concerns are still unclear... You're asking who makes the best automobile? There are a lot of companies that make great automobiles, but the question is, which automobile and for what purpose do you want one????None of the lenses you listed is a better quality than what you already have... Unless you define a specific task that you want the lens to perform... You can buy a lens with a longer focal length, or you can buy a lens with a faster speed... and you can get crazy and buy a lens with both a longer focal length, and a faster speed...  increasing either the focal length or the speed only increases your costs, but doesn't improve your quality...</blockquote>