Thank you, for the explanation, Peter.
I've been using the camera the last few nights. I thought there was a fogging issue, but, I think it may have been thin cloud that was causing the foggy appearance, as the last few nights have yielded beautiful clean images.
Once I finish my current project, I'll be in touch (unless Bill gets back to me and says it's fine to send the camera to the US for heart surgery).
Thanks!
H