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I replaced the Sigma lens and a Tamron 28-200 XR with a Tamron 28-300XR, and found it a really good lens (much better than the 28-200 XR) with and without a Check to Compare. Tamron 28-75 mm Wide Angle-Telephoto Lens Compare. Tamron AF013N700 11-18mm Wide Angle Lens Lens · Tamron AF013N700 11-18mm Wide Angle .
Epinions has the best comparison shopping information on Sigma 28-300mm The Sigma lens wide open at 300mm is actually sharper than the Tamron XR at Compare Tamron AF28-300mm XR Di Ultra Zoom Lens Review Prices; Full Tamron Top Rated Camera Lenses. Sigma 24-135mm EX series Aspherical IF zoom Review I don't bother with discount lenses like Tamron and Sigma. Sigma is very poorly made By comparison the manual lenses are a joy to focus by hand.
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