The lens design never changed. The single coated version should perform well if a good shade or compendium is used. Once I made a test comprising several lenses, single and multicoated, shot against the sun, and the 250/5,6 with a compendium shade and mask gave by far the best results. Without a shade, all lenses suffered from horrible flare. But make sure that the shutter is working accurate if you chose a silver lens.