alaTest has collected and analyzed 6 user reviews of Sigma 500 / 4,5 EX/DG/HSM/IF from Amazon.com. The average user rating for this product is 4.7/5, compared to an average user rating of 4.3/5 for other products in the same category on Amazon.com. Comments about the usability and price are generally positive. Comments are divided on the reliability.

The only one thing that does work dispite what Sigma says, the lens does auto focus on a Canon 1 series body with a teleconvertor, but with the 2x times it does hunt a bit, but with the 1.4x + tripod great combo.

The only one thing that does work dispite what Sigma says, the lens does auto focus on a Canon 1 series body with a teleconvertor, but with the 2x times it does hunt a bit, but with the 1.4x + tripod great combo.