Sigma+Tamron=Canon

My Ipoh cousin (George) came down yesterday. We both agreed to exchange lens to play. I use my Canon EF 28-135mm f/3.5-5.6 IS USM exchange with his Sigma70-300mm F4-5.6 DG MACRO 1:2 and Tamron SP AF90mm F/2.8 Di Macro Lens 1:1. So now i am planing to go Orchid Park this weekend to try out this 2 lens. Hopefully have good result.