I've asked a version of this question on the tech. forum and gotted some helpful information. Now I thought I would ask a somewhat similar question here. I'm using a D70 with the 300 and (sometimes) a 1.4. Has anyone using this set up noticed the camera/lens struggling to focus, and in some cases, not focusing at all? I know the D70 has a weaker focusing motor than others but with a fully charged battery should it be this bad?