Thanks for the ideas. Optar seems to be pretty old and soft from test results I have read. Have considered the Ektar but it's not MC and has a weird filter size. The Congos are new but seem to have variable quality but I think it's worth the gamble to get a modern MC lens in a copal shutter.....this will be my lightweight alternative to the Nikon SW 90/8 so not rushing to find one.