I am planning to do more macro photography. I do not have a macro lens, and am wondering if I need one. I use the Olympus OMD EM5 II (micro 4/3, crop factor 2) camera and have the Olympus 12-100 f4, 40-150 f2.8, and 12-40 f2.8 Pro lenses (mm doubled, of course, for 35mm equivalent). These lenses are very sharp and have quite short closest focusing distances.
Given that the lenses I have allow me to fill the frame with a sharp image of a small object even though they are not 1:1, I am not sure what additional benefit I would get from a true macro lens such as the Olympus 60mm f2.8. Is there something special about true macro lenses that I do not yet understanding?
I would much appreciate an explanation,
Trevor