[Stonius (Markus)]

I want to do some experiments with colimation, but in lockdown, I don't have access to much outdoor space. I'm wondering if I put, say a reversed barlow between the scope and the artificial star, maybe I could 'push it back' so my 6m hallway is long enough to achieve focus?

Or if not a barlow, any other lens systems that would project the star at infinity?

Cheers

Markus