Released in 1994, this is the newest version of this lens. Contrast and center resolution is very high from f2.8. The off-center performance, however, is not good. The edges of the frame (not just the corners) are soft until f8. Perhaps Leica-R lenses are intended to be used on film full frame cameras only and edges don't matter much, but this is very disappointing for a 28/2.8. (F mount converted and tested on D3.)