jmbillings

Sorry to resurrect a slightly old thread, however I was curious about the specs for the flattener/reducer. Various websites all have the same blurb which states: "The flattener / reducer illuminates a full frame format and provides pinpoint star imaging over a 30mm image circle" - but a FF image circle must be at least 35mm. So is there an error in the specs? Or does it mean that although it'll illuminate a FF image, stars around the edge will be soft? Or something else? (my occasional imaging is done with both converted and unconverted Sony A7/A9 cameras hence the question)