The Century 2000 conversion for the Canon 300mm adds a PL Mount, improved iris blades calibrated to T-Stops that gives a nice round soft bokeh and cinema gears on the focus and iris rings.
The Century 2000 conversion for the Canon 400mm adds a PL Mount, improved iris blades calibrated to T-Stops that gives a nice round soft bokeh and cinema gears on the focus and iris rings.