I'm installing a 50x34 compact crank on my Raleigh and the Campagnolo NR front derailleur doesn't seem to be able to handle the shift from the small to large chain ring. Has anyone installed a 50x34 crank on a vintage bike? And if so, what FD did they find worked for them?

I'm using an IRD compact. I believe they're made by Tange-Seiki.

Shimano 600 model 6207
Shimano 600 tricolor model 6400
Shimano 105 model 1050
Shimano Sport LX model A452

all my road bikes have compact cranks and the 4 above FDs shift great on the bikes.
the cranks are all 110bcd arms from the '80s and only one bike has ramped chainrings. They shift unramped rings just fine.

Anything designed for a triple chain ring, as long as your shifter has the range to pull it. The really wide MTB stuff with the stepped cages is probably overkill, though.

I'm a little surprised your NR FD won't hack it. Do you have a big range cogs out back? Is your chain maybe too long?

The one on my 50/34 is an RX100 from the mid 90's I think. (the pic shows 50/36 but I changed the inner ring to 34 at some point) The RX100 I have is mechanically identical to the TriColor 600/Ultegra one I have, same as [MENTION=150273]thinktubes[/MENTION] posted above. Haven't installed it yet, but I will. When I decide I can't live without those three little rectangles of color on my FD.

My UO8 came from the factory with 52-36 and even the Simplex Prestige handled it nicely. Most of my bikes now are set up with 48-34 and they work just fine.

Check the angle of the cage when viewed from above. Also check that it isn't mounted too high on the ST.

Check the height and angle. A penny should just fit between the big chainring and the derailleur cage.

It should work if set up correctly.

Suntour Cyclone MkII with a 52/34
(Also using the same FD with a 52/44/28 triple)

As others have said, most any FD that works on a triple should work. I'd stay away from modern triple derailleurs- as they're kind of meant for indexed systems with specific sized chainrings.

WHEN, are you asking it to Up shift from the 34? Crest of the hill or while still hammering?

I'm still trying to set it up in my workshop.

Following Lascauxcaveman's adviceI checked the chain length. Although it looked OK by the big ring-big cog method, I removed one link and carefully adjusted the FD positioning and it works fine.

Thanks for all the suggestions.

How would too long a chain make small-to-large ring shifting harder?

I don't know, but it seems to work now.