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Which lens you should buy Sigma 2870mm F28 vs Tamron 2875mm F28 Di III RXD Lens?We quite liked the RXD AF motor on the 2875mm f/28 but on the 1728mm f/28, it's a bit on the slow side Overall, the Tamron 1728mm f/28 Di III RXD is a solid performer It doesn't excel in any criteria but it does the job and, possibly more important than that, it does so for a reasonable priceBlending a sleek formfactor with a versatile working range, the 2875mm f/28 Di III RXD from Tamron is a fullframecompatible lens for Sony Emount mirrorless cameras Spanning wideangle to portraitlength, a constant f/28 maximum aperture complements this range and affords increased control over depth of field along with enhanced lowlight performance Tamron 28 75mm F 2 8 Di Iii Rxd Tamron 28-75mm f/2.8 di iii rxd dxomark