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juju, your macro work with the 12-50 is outstanding.
the images on this page are with the 75 + extension tubes. Others are with the 12-50 which I do find adequate for macro. I do get a bit frustrated getting so many out of focus shots. Contrast focus does not work well for small dark insects on brighter flowers. The focus as designed does go to the higher contrast flower rather than the insect. In manual focus which is the only way round this, I prefer the longer EF 100mm f2.8 , where I can rock to and fro to get the focusing more precise. It's all fun and if not a challenge it would be too easy