Why don't you keep that 70-200 2.8 and get a 77mm Canon 500D close up lens, that screws on the zoom like a filter? They go for about $150. The advantageis that you would get a macro lens with variable minimal focusing distance. As you see there are different macro lenses with different focal lengths (and MFDs) and by keeping your zoom and buying the close up lens you would have it all. The disadvantage would be slightly decreased periferal sharpness, which, by the way, is not that bad on a good quality lens that you have,plus, this phenomenonis not necessaryan issue in macro photography. There are many happy reviews of this close up lens, especially coming from 70-200 2.8 users of both Canon and Nikon kits. If you find this lens not being satisfactory and once you establish your favourite focal length you can move on to a dedicated macro lens.
The reason why I am writing all that is my own experience with macro. I started with the Canon's original 100 2.8 and I loved it for many reasons but I found it to be too short to photograph certain bugs, they would simply escape when I got closer to them, especially with the hood on. I tried my brother's Sigma 150 2.8 and loved it aswell but it was still not long enoughfor some little critters. I wound up selling the 100 and buying Sigma 180mm 3.5 (Canon's 180Lwas just too pricey) andfound that it works forwhatI photograph. I occasionally use it with Sigma's 1.4 teleconverter with very goodresults.
My 2 pennies... And good luck with whatever you will wind up buying.[]




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