Thanks for the welcomes and the messages and info. I have just looked at the metadata for some of the better shots from the D7000 and for the best shots all values are between f/ 4.2 and f/8 2-4 seconds exposure ISO between 100-400 For the D 70 f4 and 1/60th to 1/2 sec exposures but there's no info on ISO in the metadata. Most shots are grainy but some are at much lower noise levels . It was my first day out with the D70 though.
I was more than happy with the shots from the D7000 and disappointed with the D70 but as it was my first IR shoot with both cameras there is still a lot to learn.