Andy Li Profile Topics Started Replies Created Engagements Favourites Search replies: Forum Replies Created Viewing 1 post (of 1 total) Author Posts 21 July 2018 at 2:54 pm in reply to: backfocus #579738 Andy LiParticipant Thanks Gary the 0.8 reducer is from altair astro. There is also the complication of a skywatcher 2 speed crayford on my c9.25. When people quote spacer distances – they do mean approximate distances don’t they? Author Posts Viewing 1 post (of 1 total)