Thanks Phil. Yes I've seen Pete's page, he does some great imaging. This question is more along the lines of getting some discussion going on what's possible now using digital guiding rather than reticle/visual guiding, and how short a FL is too short for autoguiding. As you can see Robby's really pushing it
and I'm starting to wonder if it would be possible with a 200mm camera lens for a 2000mm imaging scope.
What is the limit and still maintain trail free images?