[PaulSthcoast (Paul)]

Thanks again Martin, good advice.

Ray, I found another quick stack of 7 x 120 seconds.

I also worked out the f ratio for these images was around f/4.7
using a home brew reducer/flattener.

This would account for the greater field of view.

Thanks for your comments.

I am somewhat humbled to think I have given you some inspiration.

Paul.