Hi
I just tested three different shutters on my Rodie 90 HR-W to see the difference of the bokeh.
See the pictures:
4636.jpg: Linhof Synchro Compur, 5 blades
4637.jpg: Old Synchro Compur, 10 blades
4638.jpg: Copal 0, 7 blades
The oldest Synchro Compur with 10 aperture blades is the clear winner concerning bokeh for me.
All the expensive techcam Rodies and Schneiders, called the "best lenses" can't be bought with more than 7 aperture blades.
It's a shame.
The 5 bladed Linhof Synchro Compur shows the best contrast. The older Compur and the Copal seem to generate some internal reflections.
You can see this around the lamp (the big white spot in the background). The blades of the old Compur are not mate and grey.
Regards,
Ben