I was looking to adapt a Canon fd 100 f/4 macro on my olympus om-d e-m1. Anyone use this lens? How is sharpness, contrast, and color? Any other good macro lenses under $200 (not 30mm panny, too short) with a faster aperture that is tack-sharp or close to it? I like the idea of the olympus 60mm f/2.8 but it is just a tad too much. Thanks. Josiah.