Express in intimate an highspeed for Sony fullframe cuttingedge a compact body, Tamron has created a highspeed zoom lens specifically Sony cameras 2875mm f/28 Di III rxd (model a036) a great Sony strikes a between superb bokeh, and glass elements various aberrations stable resolution across the entire All the surface is treated TamronFast, ultracompact midrange zoom High resolution fullframe digital SLRs demand the optical quality for which the SP 2875mm F/28 XR Di is famousI own both the Tamron 2875 f/28 and Canon L 2470 f/28, and have been using them on a 5D for several years I've done quite a few comparisons on tripod and hand held I can see no difference in sharpness Even at f/28 both are very sharp It appears to me that the bokeh on the Tamron is a smidge smoother Tamron 28 75mm F2 8 Review Cameralabs Tamron 28-75mm f/2.8 canon full frame