Dura ace 9 shifters and cassette with 8 speed rear derailleur?

[foggyridge]

Will this combination work together at least ok, or is buying a new 9 speed DA rear derailleur a must?

 

[maarten]

It worked for me.

I have 9 speed ultegra shifters and 8speed dura-ace derailleur on my spare bike.
I replaced the derailleur wheels with 9-speed wheels and it works fine.