I have three macro lenses: Hexanon 55mm Macro, Oly 12-50, and the MCON-P01 macro converter on the Oly 40-150. I thought it would be interesting to compare them using a dollar bill: all lenses on tripod, IS off, f6.3 with image framing as close as possible. The resulting closest working distances were 5", 3" and 10", resp., with the Oly 40-150 at 150. The Oly 12-50 is fixed at 43mm when in macro mode, so working distances correspond to focal length. Each lens has a different color cast, which may be attributable to the distance from the target and my lighting - I wouldn't try to conclude anything on this issue. For some reason certain shots showed the 'bleed through' (yellow color) from the back of the bill more than others, as well. All are jpegs OOC with Auto Contrast applied. Here is Center at 100%: Here is Edge at 100%: Some conclusions: 1. Sharpness is best with the Hexanon macro, but the Oly 12-50 is very close. The screen shots don't do the Hexanon justice. 2. The MCON is quite good at center, but suffers from chroma aberration at and lack of sharpness at the edges. 3. Working distance can be a big deal with macro, and the longer FL of the MCON/40-150 is significant. 4. The Macro capability is a nice add-on to the 12-50, with limited flexibility 5. The dedicated macro, especially with extension rings gives the most flexibility, but the MCON is excellent value and very convenient. BTW, I accidentally used lower resolution settings: Msf 3200x2400, but I don't think that made a difference.