Moon halo

Well, I think I've worked out how to find and keep "infinity" on these new fangled lenses but, alas, light cloud means little or no stars.

I saw an article a while ago about putting tape on the focus ring but didn't much like that idea.  Came up with the idea of using a couple of thick rubber bands around where the focus ring meets the fixed part of the lens.  Makes it much harder to turn / bump it out of focus once found but can still move it if needed.

Found an interesting layperson's article on the subject of "infinity" if you're interested.