Switch Dura Ace 7800 crank to 7950 compact...Help

[sleeeepguy]

want to switch from a 7800 dura ace crank to the new 7950 compact cranks. Do I need to change front deraileur? chain? anything else?
thank you.

 

[Peter@vecchios]

want to switch from a 7800 dura ace crank to the new 7950 compact cranks. Do I need to change front deraileur? chain? anything else?
thank you.

Lower front derailleur and perhaps take a link out of the chain, go ride.