Sb50dx & D40

83FLH06 3:24am, 30 September 2008
I bought a D40 this week and attached it to my sb-50dx. It seems like the strobe is not triggering correctly. And it does not allow me to turn off the built in flash and use the strobe, it either flashes the buit in- or comes out faded because of too much light.
Is my sb-50dx too old to work correctly with this newer camera?
Any help is appreciated.
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