[davidmanze]

Reposting a smaller section that doesn't need lowering JPEG quality.
Actually the section is from the center, so it shouldn't be a lens defect... but I'm still puzzled.

Still seeing more purple than blue ......
Could you say exactly what the lens model is and approx age ?  ...... (I had a Sigma 105 macro screw drive lens)
 purple fringing can turn up anywhere in the frame including the center when there is strong contrast ... I am no expert as we all know, but it doesn't follow the same rules as standard CA ... it doen't look too bad and the fact that the butterfly is black and white should make it easy to correct with the adjustment brush and de-saturate colour...... 
  

OT ...... I just had to order another printer, the Epson ET-2810, as my previous printer's  reliability (Epson ET-2710) was curtailed by a drunken dancer falling on top of it! .... 
  motto: 
    ....... keep printers out of reach of drunken dancers .....